refactor: shared logic for diff implementation of isInUseableZone, improved docs and readability;

Mage.Sets/src/mage/cards/a/AjanisLastStand.java

@@ -103,7 +103,7 @@ class AjanisLastStandTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/a/AthreosGodOfPassage.java

@@ -157,7 +157,7 @@ class AthreosDiesCreatureTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/a/AvacynsCollar.java

@@ -95,7 +95,7 @@ class AvacynsCollarTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/b/Bereavement.java

@@ -78,7 +78,7 @@ class BereavementTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/d/DeathTyrant.java

@@ -95,7 +95,7 @@ class DeathTyrantTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/d/DeathsPresence.java

@@ -82,7 +82,7 @@ class DeathsPresenceTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/d/DiregrafCaptain.java

@@ -103,7 +103,7 @@ class DiregrafCaptainTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/f/FalkenrathNoble.java

@@ -92,7 +92,7 @@ class FalkenrathNobleTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/g/GraveBetrayal.java

@@ -97,8 +97,8 @@ class GraveBetrayalTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/g/GravePact.java

@@ -77,8 +77,8 @@ class GravePactTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/g/GutterGrime.java

@@ -86,8 +86,8 @@ class GutterGrimeTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/h/HatefulEidolon.java

@@ -109,7 +109,7 @@ class HatefulEidolonTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/i/InfestedThrinax.java

@@ -94,7 +94,7 @@ class InfestedThrinaxTriggeredAbility extends DelayedTriggeredAbility {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/l/LuminousBroodmoth.java

@@ -101,8 +101,8 @@ class LuminousBroodmothTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/l/LyndeCheerfulTormentor.java

@@ -103,8 +103,8 @@ class LyndeCheerfulTormentorCurseDiesTriggeredAbility extends TriggeredAbilityIm
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 
     @Override

Mage.Sets/src/mage/cards/m/MarchesaTheBlackRose.java

@@ -104,8 +104,8 @@ class MarchesaTheBlackRoseTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/m/MariTheKillingQuill.java

@@ -206,8 +206,8 @@ class MariTheKillingQuillCreatureDiesAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/m/MartyrsBond.java

@@ -91,8 +91,8 @@ class MartyrsBondTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/m/MassacreGirl.java

@@ -108,7 +108,7 @@ class MassacreGirlDelayedTriggeredAbility extends DelayedTriggeredAbility {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/m/MassacreWurm.java

@@ -85,7 +85,7 @@ class MassacreWurmTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/m/MillicentRestlessRevenant.java

@@ -125,11 +125,11 @@ class MillicentRestlessRevenantTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         if (event.getType() == GameEvent.EventType.ZONE_CHANGE) {
-            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
         } else {
-            return super.isInUseableZone(game, source, event);
+            return super.isInUseableZone(game, sourceObject, event);
         }
     }
 

Mage.Sets/src/mage/cards/m/MimicVat.java

@@ -110,8 +110,8 @@ class MimicVatTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/m/MolderBeast.java

@@ -78,7 +78,7 @@ class MolderBeastTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/m/MycoidShepherd.java

@@ -94,7 +94,7 @@ class MycoidShepherdTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/n/Necroskitter.java

@@ -96,7 +96,7 @@ class NecroskitterTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/n/NetherTraitor.java

@@ -98,7 +98,7 @@ class NetherTraitorTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/n/NimDeathmantle.java

@@ -112,8 +112,8 @@ class NimDeathmantleTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/o/OrahSkyclaveHierophant.java

@@ -98,7 +98,7 @@ class OrahSkyclaveHierophantTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/p/PatronOfTheVein.java

@@ -110,8 +110,8 @@ class PatronOfTheVeinCreatureDiesTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/p/PiasRevolution.java

@@ -131,7 +131,7 @@ class PiasRevolutionTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/p/ProperBurial.java

@@ -80,7 +80,7 @@ class ProperBurialTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/p/Purgatory.java

@@ -106,8 +106,8 @@ class PurgatoryTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/r/Remembrance.java

@@ -96,7 +96,7 @@ class RemembranceTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/r/RhukHexgoldNabber.java

@@ -114,11 +114,11 @@ class RhukHexgoldNabberTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         if (event.getType() == GameEvent.EventType.ZONE_CHANGE) {
-            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
         } else {
-            return super.isInUseableZone(game, source, event);
+            return super.isInUseableZone(game, sourceObject, event);
         }
     }
 }

Mage.Sets/src/mage/cards/r/RienneAngelOfRebirth.java

@@ -113,8 +113,8 @@ class RienneAngelOfRebirthTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/s/SacredGround.java

@@ -79,7 +79,7 @@ class SacredGroundTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/s/Sangromancer.java

@@ -80,8 +80,8 @@ class SangromancerFirstTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/s/ScrapTrawler.java

@@ -94,7 +94,7 @@ class ScrapTrawlerTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/s/Scrapheap.java

@@ -80,7 +80,7 @@ class ScrapheapTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/s/SeerOfStolenSight.java

@@ -89,7 +89,7 @@ class SeerOfStolenSightTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/s/ShelobChildOfUngoliant.java

@@ -189,8 +189,8 @@ class ShelobChildOfUngoliantTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/s/SlagstoneRefinery.java

@@ -83,7 +83,7 @@ class SlagstoneRefineryTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/s/SlayersPlate.java

@@ -92,7 +92,7 @@ class SlayersPlateTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/s/Sporogenesis.java

@@ -108,8 +108,8 @@ class SporogenesisTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/s/SyrKonradTheGrim.java

@@ -96,8 +96,8 @@ class SyrKonradTheGrimTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 
     @Override

Mage.Sets/src/mage/cards/t/TheScorpionGod.java

@@ -109,8 +109,8 @@ class TheScorpionGodTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/t/TheSkullsporeNexus.java

@@ -171,8 +171,8 @@ class TheSkullsporeNexusTrigger extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/t/TianaShipsCaretaker.java

@@ -102,8 +102,8 @@ class TianaShipsCaretakerTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/v/VerdantSuccession.java

@@ -101,8 +101,8 @@ class VerdantSuccessionTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }
 

Mage.Sets/src/mage/cards/v/VillageCannibals.java

@@ -78,7 +78,7 @@ class VillageCannibalsTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/v/VindictiveVampire.java

@@ -70,8 +70,8 @@ class VindictiveVampireTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 
     @Override

Mage.Sets/src/mage/cards/v/ViridianRevel.java

@@ -81,7 +81,7 @@ class ViridianRevelTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage.Sets/src/mage/cards/x/XiraTheGoldenSting.java

@@ -105,7 +105,7 @@ class XiraTheGoldenStingTriggeredAbility extends WhenTargetDiesDelayedTriggeredA
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage/src/main/java/mage/abilities/Ability.java

@@ -86,9 +86,6 @@ public interface Ability extends Controllable, Serializable {
      * Gets the id of the object which put this ability in motion.
      * <p>
      * WARNING, MageSingleton abilities contains dirty data here, so you can't use sourceId with it
-     *
-     * @return The {@link java.util.UUID} of the object this ability is
-     * associated with.
      */
     UUID getSourceId();
 
@@ -358,16 +355,17 @@ public interface Ability extends Controllable, Serializable {
      * - for leave battlefield triggers - keep default + set setLeavesTheBattlefieldTrigger(true)
      * - for dies triggers - override and use TriggeredAbilityImpl.isInUseableZoneDiesTrigger inside + set setLeavesTheBattlefieldTrigger(true)
      *
-     * @param source can be null for static continues effects checking like rules modification (example: Yixlid Jailer)
+     * @param sourceObject can be null for static continues effects checking like rules modification (example: Yixlid Jailer)
+     * @param event can be null for state base effects checking like "when you control seven or more" (example: Endrek Sahr, Master Breeder)
      */
-    boolean isInUseableZone(Game game, MageObject source, GameEvent event);
+    boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event);
 
     /**
      * Returns true if the source object has currently the ability (e.g. The
      * object can have lost all or some abilities for some time (e.g. Turn to
      * Frog)
      */
-    boolean hasSourceObjectAbility(Game game, MageObject source, GameEvent event);
+    boolean hasSourceObjectAbility(Game game, MageObject sourceObject, GameEvent event);
 
     /**
      * Returns true if the ability has a tap itself in their costs
@@ -485,6 +483,7 @@ public interface Ability extends Controllable, Serializable {
 
     /**
      * Finds the source object regardless of its zcc. Can be LKI from battlefield in some cases.
+     * Warning, do not use with singleton abilities
      */
     MageObject getSourceObject(Game game);
 

Mage/src/main/java/mage/abilities/AbilityImpl.java

@@ -1175,35 +1175,31 @@ public abstract class AbilityImpl implements Ability {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        if (!this.hasSourceObjectAbility(game, source, event)) {
+        if (!this.hasSourceObjectAbility(game, sourceObject, event)) {
             return false;
         }
 
+        // workaround for singleton abilities like Flying
+        UUID affectedSourceId = getRealSourceObjectId(this, sourceObject);
+
         // in command zone
         if (zone == Zone.COMMAND) {
-            if (this.getSourceId() == null) { // commander effects
+            if (affectedSourceId == null) {
+                // commander effects
                 return true;
-            }
+            } else {
-            MageObject object = game.getObject(this.getSourceId());
+                MageObject object = game.getObject(affectedSourceId);
                 // emblem/planes are always actual
                 if (object instanceof Emblem || object instanceof Dungeon || object instanceof Plane) {
                     return true;
                 }
             }
-
-        UUID parameterSourceId;
-        // for singleton abilities like Flying we can't rely on abilities' source because it's only once in continuous effects
-        // so will use the sourceId of the object itself that came as a parameter if it is not null
-        if (this instanceof MageSingleton && source != null) {
-            parameterSourceId = source.getId();
-        } else {
-            parameterSourceId = getSourceId();
         }
 
         // on entering permanents - must use static abilities like it already on battlefield
         // example: Tatterkite enters without counters from Mikaeus, the Unhallowed
-        if (game.getPermanentEntering(parameterSourceId) != null && zone == Zone.BATTLEFIELD) {
+        if (game.getPermanentEntering(affectedSourceId) != null && zone == Zone.BATTLEFIELD) {
             return true;
         }
 
@@ -1212,7 +1208,7 @@ public abstract class AbilityImpl implements Ability {
         // any trigger conditions, and continuous effects that exist at that time are used to determine what the
         // trigger conditions are and what the objects involved in the event look like.
         // ...
-        Zone sourceObjectZone = game.getState().getZone(parameterSourceId);
+        Zone sourceObjectZone = game.getState().getZone(affectedSourceId);
 
         // 603.10.
         // ...
@@ -1228,12 +1224,12 @@ public abstract class AbilityImpl implements Ability {
         // TODO: research "put into a hand or library"
         if (isTriggerCanFireAfterLeaveBattlefield(event)) {
             // permanents with normal triggers
-            if (source instanceof Permanent) {
+            if (sourceObject instanceof Permanent) { // TODO: use affectedSourceObject here?
                 // support leaves-the-battlefield abilities
                 sourceObjectZone = Zone.BATTLEFIELD;
             }
             // permanents with continues effects like Yixlid Jailer, see related code "isInUseableZone(game, null"
-            if (source == null && this instanceof StaticAbility) {
+            if (sourceObject == null && this instanceof StaticAbility) {
                 sourceObjectZone = Zone.BATTLEFIELD;
             }
         }
@@ -1267,6 +1263,7 @@ public abstract class AbilityImpl implements Ability {
             //   need research: is it ability's or event's task?
             //   - ability's task: code like ability.setLookBackInTime
             //   - event's task: code like current switch
+            // TODO: alternative solution: replace check by source.isLeavesTheBattlefieldTrigger?
             switch (e.getType()) {
                 case DESTROYED_PERMANENT:
                 case EXPLOITED_CREATURE:
@@ -1279,31 +1276,43 @@ public abstract class AbilityImpl implements Ability {
         });
     }
 
-    @Override
+    /**
-    public boolean hasSourceObjectAbility(Game game, MageObject source, GameEvent event) {
+     * Find real source object id from any ability (real and singleton)
-        // if source object have this ability
+     */
-        // uses for ability.isInUseableZone
+    protected static UUID getRealSourceObjectId(Ability sourceAbility, MageObject sourceObject) {
-        // replacement and other continues effects can be without source, but active (must return true)
+        // In singleton abilities like Flying we can't rely on ability's source because it's init only once in continuous effects
-
-        MageObject object = source;
-        // for singleton abilities like Flying we can't rely on abilities' source because it's only once in continuous effects
         // so will use the sourceId of the object itself that came as a parameter if it is not null
+        if (sourceAbility instanceof MageSingleton && sourceObject != null) {
+            return sourceObject.getId();
+        } else {
+            return sourceAbility.getSourceId();
+        }
+    }
+
+    @Override
+    public boolean hasSourceObjectAbility(Game game, MageObject sourceObject, GameEvent event) {
+        MageObject object = sourceObject;
         if (object == null) {
             object = game.getPermanentEntering(getSourceId());
             if (object == null) {
                 object = game.getObject(getSourceId());
             }
         }
-        if (object != null) {
+
+        if (object == null) {
+            // replacement and other continues effects can be without source, but active (must return true all time)
+            return true;
+        }
+
+        if (!object.hasAbility(this, game)) {
+            return false;
+        }
+
+        // phase in/out support
         if (object instanceof Permanent) {
-                return object.hasAbility(this, game) && (
+            return ((Permanent) object).isPhasedIn() || this.getWorksPhasedOut();
-                        ((Permanent) object).isPhasedIn() || this.getWorksPhasedOut()
-                );
-            } else {
-                // cards and other objects
-                return object.hasAbility(this, game);
-            }
         }
+
         return true;
     }
 

Mage/src/main/java/mage/abilities/TriggeredAbilities.java

@@ -209,7 +209,7 @@ public class TriggeredAbilities extends LinkedHashMap<String, TriggeredAbility>
         if (ability.isInUseableZone(game, object, event)) {
             if (event == null || !game.getContinuousEffects().preventedByRuleModification(event, ability, game, false)) {
                 if (object != null) {
-                    boolean controllerSet = false;
+                    boolean controllerSet = false; // TODO: wtf?!?!? Need rework whole "set" logic here
                     Set<UUID> eventTargets = CardUtil.getEventTargets(event);
                     if (ability.getZone() != Zone.COMMAND
                             && event != null

Mage/src/main/java/mage/abilities/TriggeredAbility.java

@@ -72,6 +72,15 @@ public interface TriggeredAbility extends Ability {
      * If true the game “looks back in time” to determine if those abilities trigger
      * This has to be set, if the triggered ability has to check back in time if the permanent the ability is connected
      * to had the ability on the battlefield while the trigger is checked
+     * <p>
+     * 603.6c
+     * Leaves-the-battlefield abilities trigger when a permanent moves from the battlefield to another zone,
+     * or when a phased-in permanent leaves the game because its owner leaves the game. These are written as,
+     * but aren’t limited to, “When [this object] leaves the battlefield, . . .” or “Whenever [something] is put
+     * into a graveyard from the battlefield, . . . .” (See also rule 603.10.) An ability that attempts to do
+     * something to the card that left the battlefield checks for it only in the first zone that it went to.
+     * An ability that triggers when a card is put into a certain zone “from anywhere” is never treated as a
+     * leaves-the-battlefield ability, even if an object is put into that zone from the battlefield.
      */
     void setLeavesTheBattlefieldTrigger(boolean leavesTheBattlefieldTrigger);
 

Mage/src/main/java/mage/abilities/TriggeredAbilityImpl.java

@@ -348,50 +348,38 @@ public abstract class TriggeredAbilityImpl extends AbilityImpl implements Trigge
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
 
-        /**
+        // workaround for singleton abilities like Flying
-         * 603.6. Trigger events that involve objects changing zones are called
+        UUID affectedSourceId = getRealSourceObjectId(this, sourceObject);
-         * “zone-change triggers.” Many abilities with zone-change triggers
-         * attempt to do something to that object after it changes zones. During
-         * resolution, these abilities look for the object in the zone that it
-         * moved to. If the object is unable to be found in the zone it went to,
-         * the part of the ability attempting to do something to the object will
-         * fail to do anything. The ability could be unable to find the object
-         * because the object never entered the specified zone, because it left
-         * the zone before the ability resolved, or because it is in a zone that
-         * is hidden from a player, such as a library or an opponent's hand.
-         * (This rule applies even if the object leaves the zone and returns
-         * again before the ability resolves.) The most common zone-change
-         * triggers are enters-the-battlefield triggers and
-         * leaves-the-battlefield triggers.
-         *
-         * from:
-         * http://www.mtgsalvation.com/forums/magic-fundamentals/magic-rulings/magic-rulings-archives/537065-ixidron-and-kozilek
-         * There are two types of triggers that involve the graveyard: dies
-         * triggers (which are a subset of leave-the-battlefield triggers) and
-         * put into the graveyard from anywhere triggers.
-         *
-         * The former triggers trigger based on the game state prior to the move
-         * where the Kozilek permanent is face down and has no abilities. The
-         * latter triggers trigger from the game state after the move where the
-         * Kozilek card is itself and has the ability.
-         */
 
-        // process events from other objects
+        // 603.6
-        Set<UUID> eventTargets = CardUtil.getEventTargets(event);
+        // Trigger events that involve objects changing zones are called "zone-change triggers." Many abilities with
-        if (!eventTargets.contains(getSourceId())) {
+        // zone-change triggers attempt to do something to that object after it changes zones. During resolution,
-            return super.isInUseableZone(game, source, event);
+        // these abilities look for the object in the zone that it moved to. If the object is unable to be found
-        }
+        // in the zone it went to, the part of the ability attempting to do something to the object will fail to
+        // do anything. The ability could be unable to find the object because the object never entered the
+        // specified zone, because it left the zone before the ability resolved, or because it is in a zone that
+        // is hidden from a player, such as a library or an opponent’s hand. (This rule applies even if the
+        // object leaves the zone and returns again before the ability resolves.) The most common zone-change
+        // triggers are enters-the-battlefield triggers and leaves-the-battlefield triggers.
 
-        // process events from own object
+        // There are possible two different use cases:
+        // * look in current game state (normal events):
+        // * look back in time (leaves battlefield, dies, etc);
 
-        // inject process of "look back in time" events
+        // TODO: need sync or shared code with AbilityImpl.isInUseableZone
-        // TODO: need sync code with AbilityImpl.isInUseableZone
+        MageObject affectedSourceObject = sourceObject;
+        if (event == null) {
+            // state base triggers - use only actual state
+        } else {
+            // event triggers - can look back in time for some use cases
             switch (event.getType()) {
                 case ZONE_CHANGE:
                     ZoneChangeEvent zce = (ZoneChangeEvent) event;
+                    Set<UUID> eventTargets = CardUtil.getEventTargets(event);
                     if (eventTargets.contains(getSourceId()) && !zce.getToZone().isPublicZone()) {
+                        // TODO: need research and share with AbilityImpl
                         // If an ability triggers when the object that has it is put into a hidden zone from a graveyard,
                         // that ability triggers from the graveyard, (such as Golgari Brownscale),
                         // Yixlid Jailer will prevent that ability from triggering.
@@ -401,20 +389,20 @@ public abstract class TriggeredAbilityImpl extends AbilityImpl implements Trigge
                             }
                         }
                     }
-                if (isLeavesTheBattlefieldTrigger()) {
+                    if (isLeavesTheBattlefieldTrigger() && game.checkShortLivingLKI(affectedSourceId, Zone.BATTLEFIELD)) {
-                    source = zce.getTarget();
+                        affectedSourceObject = game.getLastKnownInformation(affectedSourceId, Zone.BATTLEFIELD);
                     }
                     break;
                 case DESTROYED_PERMANENT:
                 case EXPLOITED_CREATURE:
-                if (isLeavesTheBattlefieldTrigger()) {
+                    if (isLeavesTheBattlefieldTrigger() && game.checkShortLivingLKI(affectedSourceId, Zone.BATTLEFIELD)) {
-                    source = game.getLastKnownInformation(getSourceId(), Zone.BATTLEFIELD);
+                        affectedSourceObject = game.getPermanentOrLKIBattlefield(affectedSourceId);
                     }
                     break;
             }
+        }
 
-        // all other events from own object
+        return super.isInUseableZone(game, affectedSourceObject, event);
-        return super.isInUseableZone(game, source, event);
     }
 
     @Override
@@ -464,23 +452,26 @@ public abstract class TriggeredAbilityImpl extends AbilityImpl implements Trigge
      * (Similar logic must be used for any leaves-the-battlefield, but this method assumes to graveyard only.)
      * NOTE: If your ability functions from another zone (not battlefield) then must use standard logic, not this.
      */
-    public static boolean isInUseableZoneDiesTrigger(TriggeredAbility source, GameEvent event, Game game) {
+    public static boolean isInUseableZoneDiesTrigger(TriggeredAbility sourceAbility, MageObject sourceObject, GameEvent event, Game game) {
         // runtime check: wrong trigger settings
-        if (!source.isLeavesTheBattlefieldTrigger()) {
+        if (!sourceAbility.isLeavesTheBattlefieldTrigger()) {
             throw new IllegalArgumentException("Wrong code usage: all dies triggers must use setLeavesTheBattlefieldTrigger(true) and override isInUseableZone - "
-                    + source.getSourceObject(game) + " - " + source);
+                    + sourceAbility.getSourceObject(game) + " - " + sourceAbility);
         }
 
         // runtime check: wrong isInUseableZone for batch related triggers
         if (event instanceof BatchEvent) {
             throw new IllegalArgumentException("Wrong code usage: batch events unsupported here, possible miss of override isInUseableZone - "
-                    + source.getSourceObject(game) + " - " + source);
+                    + sourceAbility.getSourceObject(game) + " - " + sourceAbility);
         }
 
-        // Get the source permanent of the ability
+        // workaround for singleton abilities like Flying
-        MageObject sourceObject = null;
+        UUID affectedSourceId = getRealSourceObjectId(sourceAbility, sourceObject);
-        if (game.getState().getZone(source.getSourceId()) == Zone.BATTLEFIELD) {
+
-            sourceObject = game.getPermanent(source.getSourceId());
+        // on permanent - can use actual or look back in time
+        MageObject affectedObject = null;
+        if (game.getState().getZone(affectedSourceId) == Zone.BATTLEFIELD) {
+            affectedObject = game.getPermanent(affectedSourceId);
         } else {
             //  The idea: short living LKI must help to find a moment in the inner of resolve
             //  -
@@ -498,26 +489,29 @@ public abstract class TriggeredAbilityImpl extends AbilityImpl implements Trigge
             //   - ! empty stack   !  graveyard  ! no  !   no      ! no more to resolve
             //   --!---------------!-------------!-----!-----------!
             //  -
-            if (game.checkShortLivingLKI(source.getSourceId(), Zone.BATTLEFIELD)) {
+            if (game.checkShortLivingLKI(affectedSourceId, Zone.BATTLEFIELD)) {
-                sourceObject = game.getLastKnownInformation(source.getSourceId(), Zone.BATTLEFIELD);
+                affectedObject = game.getLastKnownInformation(affectedSourceId, Zone.BATTLEFIELD);
-            }
-        }
-        if (sourceObject == null) { // source is no permanent
-            sourceObject = game.getObject(source);
-            if (sourceObject == null || sourceObject.isPermanent(game)) {
-                return false; // No source object found => ability is not valid
             }
         }
 
-        if (!source.hasSourceObjectAbility(game, sourceObject, event)) {
+        if (affectedObject == null) {
+            affectedObject = game.getObject(sourceAbility);
+            if (affectedObject == null || affectedObject.isPermanent(game)) {
+                // if it was a permanent, but now removed then ignore
+                return false;
+            }
+        }
+
+        if (!sourceAbility.hasSourceObjectAbility(game, affectedObject, event)) {
             return false; // the permanent does currently not have or before it dies the ability so no trigger
         }
 
         // check now it is in graveyard (only if it is no token and was the target itself)
-        if (source.getSourceId().equals(event.getTargetId()) // source is also the target
+        // TODO: need research
-                && !(sourceObject instanceof PermanentToken) // it's no token
+        if (affectedSourceId.equals(event.getTargetId()) // source is also the target
-                && sourceObject.getZoneChangeCounter(game) + 1 == game.getState().getZoneChangeCounter(source.getSourceId())) { // It's in the next zone
+                && !(affectedObject instanceof PermanentToken) // it's no token
-            Zone after = game.getState().getZone(source.getSourceId());
+                && affectedObject.getZoneChangeCounter(game) + 1 == game.getState().getZoneChangeCounter(affectedSourceId)) { // It's in the next zone
+            Zone after = game.getState().getZone(affectedSourceId);
             if (!Zone.GRAVEYARD.match(after)) { // Zone is not the graveyard
                 return false; // Moving to graveyard was replaced so no trigger
             }

Mage/src/main/java/mage/abilities/common/DealtDamageAndDiedTriggeredAbility.java

@@ -85,7 +85,7 @@ public class DealtDamageAndDiedTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage/src/main/java/mage/abilities/common/DealtDamageAttachedAndDiedTriggeredAbility.java

@@ -79,7 +79,7 @@ public class DealtDamageAttachedAndDiedTriggeredAbility extends TriggeredAbility
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage/src/main/java/mage/abilities/common/DiesAttachedTriggeredAbility.java

@@ -161,7 +161,7 @@ public class DiesAttachedTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage/src/main/java/mage/abilities/common/DiesCreatureTriggeredAbility.java

@@ -82,11 +82,11 @@ public class DiesCreatureTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         if (this.zone == Zone.BATTLEFIELD) {
-            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
         } else {
-            return super.isInUseableZone(game, source, event);
+            return super.isInUseableZone(game, sourceObject, event);
         }
     }
 }

Mage/src/main/java/mage/abilities/common/DiesOneOrMoreTriggeredAbility.java

@@ -56,10 +56,10 @@ public class DiesOneOrMoreTriggeredAbility extends TriggeredAbilityImpl implemen
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         return ((ZoneChangeBatchEvent) event)
                 .getEvents()
                 .stream()
-                .anyMatch(e -> TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, e, game));
+                .anyMatch(e -> TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, e, game));
     }
 }

Mage/src/main/java/mage/abilities/common/DiesSourceTriggeredAbility.java

@@ -42,7 +42,7 @@ public class DiesSourceTriggeredAbility extends ZoneChangeTriggeredAbility {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage/src/main/java/mage/abilities/common/DiesThisOrAnotherTriggeredAbility.java

@@ -66,7 +66,7 @@ public class DiesThisOrAnotherTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage/src/main/java/mage/abilities/common/PutIntoGraveFromAnywhereSourceTriggeredAbility.java

@@ -41,7 +41,7 @@ public class PutIntoGraveFromAnywhereSourceTriggeredAbility extends ZoneChangeTr
 //     * @return
 //     */
 //    @Override
-//    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+//    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
 //        if (game.getState().getZone(source.getId()).equals(Zone.GRAVEYARD)) {
 //            return this.hasSourceObjectAbility(game, source, event);
 //        }

Mage/src/main/java/mage/abilities/common/PutIntoGraveFromBattlefieldAllTriggeredAbility.java

@@ -66,7 +66,7 @@ public class PutIntoGraveFromBattlefieldAllTriggeredAbility extends TriggeredAbi
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage/src/main/java/mage/abilities/common/PutIntoGraveFromBattlefieldSourceTriggeredAbility.java

@@ -58,7 +58,7 @@ public class PutIntoGraveFromBattlefieldSourceTriggeredAbility extends Triggered
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
-        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+        return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
     }
 }

Mage/src/main/java/mage/abilities/common/delayed/UntilYourNextTurnDelayedTriggeredAbility.java

@@ -107,12 +107,12 @@ public class UntilYourNextTurnDelayedTriggeredAbility extends DelayedTriggeredAb
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         if (isLeavesTheBattlefieldTrigger()) {
             // TODO: leaves battlefield and die are not same! Is it possible make a diff logic?
-            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
         } else {
-            return super.isInUseableZone(game, source, event);
+            return super.isInUseableZone(game, sourceObject, event);
         }
     }
 }

Mage/src/main/java/mage/abilities/decorator/ConditionalInterveningIfTriggeredAbility.java

@@ -137,12 +137,12 @@ public class ConditionalInterveningIfTriggeredAbility extends TriggeredAbilityIm
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         if (isLeavesTheBattlefieldTrigger()) {
             // TODO: leaves battlefield and die are not same! Is it possible make a diff logic?
-            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
         } else {
-            return super.isInUseableZone(game, source, event);
+            return super.isInUseableZone(game, sourceObject, event);
         }
     }
 }

Mage/src/main/java/mage/abilities/decorator/ConditionalTriggeredAbility.java

@@ -123,12 +123,12 @@ public class ConditionalTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         if (isLeavesTheBattlefieldTrigger()) {
             // TODO: leaves battlefield and die are not same! Is it possible make a diff logic?
-            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+            return TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
         } else {
-            return super.isInUseableZone(game, source, event);
+            return super.isInUseableZone(game, sourceObject, event);
         }
     }
 }

Mage/src/main/java/mage/abilities/keyword/HauntAbility.java

@@ -128,7 +128,7 @@ class HauntExileAbility extends ZoneChangeTriggeredAbility {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         boolean fromOK = true;
         Permanent sourcePermanent = (Permanent) game.getLastKnownInformation(sourceId, Zone.BATTLEFIELD);
         if (creatureHaunt

Mage/src/main/java/mage/abilities/meta/OrTriggeredAbility.java

@@ -127,15 +127,15 @@ public class OrTriggeredAbility extends TriggeredAbilityImpl {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         boolean res = false;
         for (TriggeredAbility ability : triggeredAbilities) {
             // TODO: call full inner trigger instead like ability.isInUseableZone()?! Need research why it fails
             if (ability.isLeavesTheBattlefieldTrigger()) {
                 // TODO: leaves battlefield and die are not same! Is it possible make a diff logic?
-                res |= TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, event, game);
+                res |= TriggeredAbilityImpl.isInUseableZoneDiesTrigger(this, sourceObject, event, game);
             } else {
-                res |= super.isInUseableZone(game, source, event);
+                res |= super.isInUseableZone(game, sourceObject, event);
             }
         }
         return res;

Mage/src/main/java/mage/designations/Monarch.java

@@ -61,7 +61,7 @@ class MonarchDrawTriggeredAbility extends BeginningOfEndStepTriggeredAbility {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         return true;
     }
 
@@ -108,7 +108,7 @@ class MonarchDealsCombatDamageToAPlayerTriggeredAbility extends TriggeredAbility
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         return true;
     }
 

Mage/src/main/java/mage/game/events/ZoneChangeEvent.java

@@ -96,8 +96,6 @@ public class ZoneChangeEvent extends GameEvent {
 
     /**
      * Source ability of the event, can be null in rare cases
-     *
-     * @return
      */
     public Ability getSource() {
         return this.source;
@@ -105,6 +103,9 @@ public class ZoneChangeEvent extends GameEvent {
 
     @Override
     public String toString() {
-        return super.toString() + ", from " + getFromZone() + " to " + getToZone();
+        return super.toString()
+                + ", from " + getFromZone() + " to " + getToZone()
+                + ", " + (this.target == null ? "no target" : "target " + this.target)
+                + ", " + (this.source == null ? "no source" : "source " + this.source);
     }
 }

Mage/src/main/java/mage/game/stack/StackAbility.java

@@ -517,12 +517,12 @@ public class StackAbility extends StackObjectImpl implements Ability {
     }
 
     @Override
-    public boolean isInUseableZone(Game game, MageObject source, GameEvent event) {
+    public boolean isInUseableZone(Game game, MageObject sourceObject, GameEvent event) {
         throw new UnsupportedOperationException("Not supported.");
     }
 
     @Override
-    public boolean hasSourceObjectAbility(Game game, MageObject source, GameEvent event) {
+    public boolean hasSourceObjectAbility(Game game, MageObject sourceObject, GameEvent event) {
         throw new UnsupportedOperationException("Not supported.");
     }