diff --git a/Mage.Sets/src/mage/cards/a/ArgothianPixies.java b/Mage.Sets/src/mage/cards/a/ArgothianPixies.java
index 961162bc6b6..3f83894ae57 100644
--- a/Mage.Sets/src/mage/cards/a/ArgothianPixies.java
+++ b/Mage.Sets/src/mage/cards/a/ArgothianPixies.java
@@ -1,7 +1,7 @@
 package mage.cards.a;
 
-import java.util.UUID;
 import mage.MageInt;
+import mage.MageObject;
 import mage.abilities.Ability;
 import mage.abilities.common.SimpleEvasionAbility;
 import mage.abilities.common.SimpleStaticAbility;
@@ -17,8 +17,9 @@ import mage.filter.common.FilterCreaturePermanent;
 import mage.game.Game;
 import mage.game.events.GameEvent;
 
+import java.util.UUID;
+
 /**
- *
  * @author MarcoMarin
  */
 public final class ArgothianPixies extends CardImpl {
@@ -40,7 +41,7 @@ public final class ArgothianPixies extends CardImpl {
                 new CantBeBlockedByCreaturesSourceEffect(filter, Duration.WhileOnBattlefield)));
 
         // Prevent all damage that would be dealt to Argothian Pixies by artifact creatures.
-        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, 
+        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD,
                 new ArgothianPixiesPreventDamageFromArtifactsEffect(Duration.WhileOnBattlefield)));
 
     }
@@ -74,7 +75,8 @@ class ArgothianPixiesPreventDamageFromArtifactsEffect extends PreventionEffectIm
     @Override
     public boolean applies(GameEvent event, Ability source, Game game) {
         if (super.applies(event, source, game)) {
-            if (game.getObject(event.getSourceId()).getCardType().contains(CardType.ARTIFACT)) {
+            MageObject sourceObject = game.getObject(event.getSourceId());
+            if (sourceObject != null && sourceObject.getCardType().contains(CardType.ARTIFACT)) {
                 return (event.getTargetId().equals(source.getSourceId()));
             }
         }
diff --git a/Mage.Sets/src/mage/cards/a/ArgothianTreefolk.java b/Mage.Sets/src/mage/cards/a/ArgothianTreefolk.java
index 90296ce1833..76ed81ab473 100644
--- a/Mage.Sets/src/mage/cards/a/ArgothianTreefolk.java
+++ b/Mage.Sets/src/mage/cards/a/ArgothianTreefolk.java
@@ -1,8 +1,7 @@
-
 package mage.cards.a;
 
-import java.util.UUID;
 import mage.MageInt;
+import mage.MageObject;
 import mage.abilities.Ability;
 import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.effects.common.PreventAllDamageToSourceEffect;
@@ -15,14 +14,15 @@ import mage.constants.Zone;
 import mage.game.Game;
 import mage.game.events.GameEvent;
 
+import java.util.UUID;
+
 /**
- *
  * @author MarcoMarin
  */
 public final class ArgothianTreefolk extends CardImpl {
 
     public ArgothianTreefolk(UUID ownerId, CardSetInfo setInfo) {
-        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{3}{G}{G}");
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{3}{G}{G}");
         this.subtype.add(SubType.TREEFOLK);
         this.power = new MageInt(3);
         this.toughness = new MageInt(5);
@@ -42,26 +42,25 @@ public final class ArgothianTreefolk extends CardImpl {
 }
 
 class PreventDamageToSourceByCardTypeEffect extends PreventAllDamageToSourceEffect {
-    
+
     private CardType cardType;
-      
-    public PreventDamageToSourceByCardTypeEffect(){
+
+    public PreventDamageToSourceByCardTypeEffect() {
         this(null);
     }
 
-    public PreventDamageToSourceByCardTypeEffect(CardType cardT){
+    public PreventDamageToSourceByCardTypeEffect(CardType cardT) {
         super(Duration.WhileOnBattlefield);
         staticText = "Prevent all damage that would be dealt to {this} by artifact sources";
         cardType = cardT;
     }
-    
+
     @Override
     public boolean applies(GameEvent event, Ability source, Game game) {
         if (super.applies(event, source, game)) {
-            if (game.getObject(event.getSourceId()).getCardType().contains(cardType)){
-                if (event.getTargetId().equals(source.getSourceId())) {
-                    return true;
-                }
+            MageObject sourceObject = game.getObject(event.getSourceId());
+            if (sourceObject != null && sourceObject.getCardType().contains(cardType)) {
+                return event.getTargetId().equals(source.getSourceId());
             }
         }
         return false;
diff --git a/Mage.Sets/src/mage/cards/b/BrandOfIllOmen.java b/Mage.Sets/src/mage/cards/b/BrandOfIllOmen.java
index 39911ca2d64..2a2a5739d0f 100644
--- a/Mage.Sets/src/mage/cards/b/BrandOfIllOmen.java
+++ b/Mage.Sets/src/mage/cards/b/BrandOfIllOmen.java
@@ -1,4 +1,3 @@
-
 package mage.cards.b;
 
 import mage.MageObject;
@@ -22,14 +21,13 @@ import java.util.Objects;
 import java.util.UUID;
 
 /**
- *
  * @author ciaccona007
  */
 public final class BrandOfIllOmen extends CardImpl {
 
     public BrandOfIllOmen(UUID ownerId, CardSetInfo setInfo) {
         super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{3}{R}");
-        
+
         this.subtype.add(SubType.AURA);
 
         // Enchant creature
@@ -95,11 +93,10 @@ class BrandOfIllOmenEffect extends ContinuousRuleModifyingEffectImpl {
     @Override
     public boolean applies(GameEvent event, Ability source, Game game) {
         Permanent brand = game.getPermanent(source.getSourceId());
-        if (brand != null && brand.getAttachedTo() != null) {
+        MageObject sourceObject = game.getObject(event.getSourceId());
+        if (sourceObject != null && brand != null && brand.getAttachedTo() != null) {
             UUID enchantedController = game.getPermanent(brand.getAttachedTo()).getControllerId();
-            if(Objects.equals(enchantedController, event.getPlayerId()) && game.getObject(event.getSourceId()).isCreature()) {
-                return true;
-            }
+            return Objects.equals(enchantedController, event.getPlayerId()) && sourceObject.isCreature();
         }
         return false;
     }
diff --git a/Mage.Sets/src/mage/cards/d/DesertNomads.java b/Mage.Sets/src/mage/cards/d/DesertNomads.java
index f3143a88c2b..ceefa1eab50 100644
--- a/Mage.Sets/src/mage/cards/d/DesertNomads.java
+++ b/Mage.Sets/src/mage/cards/d/DesertNomads.java
@@ -1,7 +1,7 @@
-
 package mage.cards.d;
 
 import mage.MageInt;
+import mage.MageObject;
 import mage.abilities.Ability;
 import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.effects.common.PreventAllDamageToSourceEffect;
@@ -19,11 +19,10 @@ import mage.game.events.GameEvent;
 import java.util.UUID;
 
 /**
- *
  * @author MarcoMarin
  */
 public final class DesertNomads extends CardImpl {
-    
+
     private static final FilterLandPermanent filter = new FilterLandPermanent("desert");
 
     static {
@@ -31,15 +30,15 @@ public final class DesertNomads extends CardImpl {
     }
 
     public DesertNomads(UUID ownerId, CardSetInfo setInfo) {
-        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{R}");
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{2}{R}");
         this.subtype.add(SubType.HUMAN);
         this.subtype.add(SubType.NOMAD);
         this.power = new MageInt(2);
         this.toughness = new MageInt(2);
 
         // Desertwalk
-        this.addAbility(new LandwalkAbility(filter));        
-        
+        this.addAbility(new LandwalkAbility(filter));
+
         // Prevent all damage that would be dealt to Desert Nomads by Deserts.
         this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new PreventDamageToSourceBySubtypeEffect(SubType.DESERT)));
     }
@@ -55,22 +54,21 @@ public final class DesertNomads extends CardImpl {
 }
 
 class PreventDamageToSourceBySubtypeEffect extends PreventAllDamageToSourceEffect {
-    
+
     private SubType subtype;
 
-    public PreventDamageToSourceBySubtypeEffect(SubType sub){
+    public PreventDamageToSourceBySubtypeEffect(SubType sub) {
         super(Duration.WhileOnBattlefield);
         subtype = sub;
         staticText = "Prevent all damage that would be dealt to {this} by " + subtype.getDescription();
     }
-    
+
     @Override
     public boolean applies(GameEvent event, Ability source, Game game) {
         if (super.applies(event, source, game)) {
-            if (game.getObject(event.getSourceId()).hasSubtype(subtype, game)){
-                if (event.getTargetId().equals(source.getSourceId())) {
-                    return true;
-                }
+            MageObject sourceObject = game.getObject(event.getSourceId());
+            if (sourceObject != null && sourceObject.hasSubtype(subtype, game)) {
+                return event.getTargetId().equals(source.getSourceId());
             }
         }
         return false;
diff --git a/Mage.Sets/src/mage/cards/m/MarblePriest.java b/Mage.Sets/src/mage/cards/m/MarblePriest.java
index 7cc77515bd5..e7b13d6842a 100644
--- a/Mage.Sets/src/mage/cards/m/MarblePriest.java
+++ b/Mage.Sets/src/mage/cards/m/MarblePriest.java
@@ -1,23 +1,24 @@
 package mage.cards.m;
 
-import java.util.UUID;
 import mage.MageInt;
+import mage.MageObject;
 import mage.abilities.Ability;
 import mage.abilities.common.SimpleStaticAbility;
 import mage.abilities.effects.common.PreventAllDamageToSourceEffect;
 import mage.abilities.effects.common.combat.MustBeBlockedByAllSourceEffect;
-import mage.constants.SubType;
 import mage.cards.CardImpl;
 import mage.cards.CardSetInfo;
 import mage.constants.CardType;
 import mage.constants.Duration;
+import mage.constants.SubType;
 import mage.constants.Zone;
 import mage.filter.common.FilterCreaturePermanent;
 import mage.game.Game;
 import mage.game.events.GameEvent;
 
+import java.util.UUID;
+
 /**
- *
  * @author TheElk801
  */
 public final class MarblePriest extends CardImpl {
@@ -66,9 +67,11 @@ class MarblePriestPreventionEffect extends PreventAllDamageToSourceEffect {
 
     @Override
     public boolean applies(GameEvent event, Ability source, Game game) {
+        MageObject sourceObject = game.getObject(event.getSourceId());
         return super.applies(event, source, game)
                 && event.getFlag()
-                && game.getObject(event.getSourceId()).hasSubtype(SubType.WALL, game)
+                && sourceObject != null
+                && sourceObject.hasSubtype(SubType.WALL, game)
                 && event.getTargetId().equals(source.getSourceId());
     }
 }