Improved alternative cost from dynamic effects (it's like #5913 PR):

* Game: added multiple cards/effects support (old version supported only 1 effect per game);
 * Game: added combo support with split and adventure cards;
 * AI: computer can see and play cards with dynamic added alternative cost (like Bolas's Citadel);
 * UI: users can see playable cards with alternative cost.

Mage.Tests/src/test/java/org/mage/test/player/TestPlayer.java

@@ -2374,20 +2374,25 @@ public class TestPlayer implements Player {
     }
 
     @Override
-    public UUID getCastSourceIdWithAlternateMana() {
+    public Set<UUID> getCastSourceIdWithAlternateMana() {
         return computerPlayer.getCastSourceIdWithAlternateMana();
     }
 
     @Override
-    public ManaCosts getCastSourceIdManaCosts() {
+    public Map<UUID, ManaCosts<ManaCost>> getCastSourceIdManaCosts() {
         return computerPlayer.getCastSourceIdManaCosts();
     }
 
     @Override
-    public Costs<Cost> getCastSourceIdCosts() {
+    public Map<UUID, Costs<Cost>> getCastSourceIdCosts() {
         return computerPlayer.getCastSourceIdCosts();
     }
 
+    @Override
+    public void clearCastSourceIdManaCosts() {
+        computerPlayer.clearCastSourceIdManaCosts();
+    }
+
     @Override
     public boolean isInPayManaMode() {
         return computerPlayer.isInPayManaMode();

Mage.Tests/src/test/java/org/mage/test/stub/PlayerStub.java

@@ -19,8 +19,8 @@ import mage.counters.Counter;
 import mage.counters.Counters;
 import mage.designations.Designation;
 import mage.designations.DesignationType;
-import mage.filter.FilterPermanent;
 import mage.filter.FilterMana;
+import mage.filter.FilterPermanent;
 import mage.game.Game;
 import mage.game.Graveyard;
 import mage.game.Table;
@@ -1208,7 +1208,7 @@ public class PlayerStub implements Player {
     }
 
     @Override
-    public UUID getCastSourceIdWithAlternateMana() {
+    public Set<UUID> getCastSourceIdWithAlternateMana() {
         return null;
     }
 
@@ -1218,15 +1218,20 @@ public class PlayerStub implements Player {
     }
 
     @Override
-    public ManaCosts getCastSourceIdManaCosts() {
+    public Map<UUID, Costs<Cost>> getCastSourceIdCosts() {
         return null;
     }
 
     @Override
-    public Costs<Cost> getCastSourceIdCosts() {
+    public Map<UUID, ManaCosts<ManaCost>> getCastSourceIdManaCosts() {
         return null;
     }
 
+    @Override
+    public void clearCastSourceIdManaCosts() {
+
+    }
+
     @Override
     public void addPermissionToShowHandCards(UUID watcherUserId) {
 
@@ -1374,19 +1379,19 @@ public class PlayerStub implements Player {
 
     @Override
     public void addPhyrexianToColors(FilterMana colors) {
-        
+
     }
 
     @Override
     public void removePhyrexianFromColors(FilterMana colors) {
-       
+
     }
 
     @Override
     public FilterMana getPhyrexianColors() {
         return (new FilterMana());
     }
-    
+
     @Override
     public SpellAbility chooseAbilityForCast(Card card, Game game, boolean noMana) {
         return card.getSpellAbility();