diff --git a/Mage.Sets/src/mage/sets/magic2010/ProteanHydra.java b/Mage.Sets/src/mage/sets/magic2010/ProteanHydra.java
index c6765dacbc..5dd5979935 100644
--- a/Mage.Sets/src/mage/sets/magic2010/ProteanHydra.java
+++ b/Mage.Sets/src/mage/sets/magic2010/ProteanHydra.java
@@ -98,7 +98,7 @@ public class ProteanHydra extends CardImpl<ProteanHydra> {
 		@Override
 		public boolean apply(Game game, Ability source) {
 			Permanent permanent = game.getPermanent(source.getSourceId());
-			if (permanent != null) {
+			if (permanent != null && source.getManaCostsToPay().getVariableCosts().size() > 0) {
 				int amount = source.getManaCostsToPay().getVariableCosts().get(0).getAmount();
 				permanent.addCounters(new PlusOneCounter(amount));
 			}
diff --git a/Mage.Sets/src/mage/sets/magic2011/GargoyleSentinel.java b/Mage.Sets/src/mage/sets/magic2011/GargoyleSentinel.java
index 321a75b15d..5ac450c2bb 100644
--- a/Mage.Sets/src/mage/sets/magic2011/GargoyleSentinel.java
+++ b/Mage.Sets/src/mage/sets/magic2011/GargoyleSentinel.java
@@ -28,6 +28,7 @@
 
 package mage.sets.magic2011;
 
+import java.util.Iterator;
 import java.util.UUID;
 import mage.Constants.CardType;
 import mage.Constants.Duration;
@@ -102,9 +103,10 @@ class GargoyleSentinelEffect extends ContinuousEffectImpl<GargoyleSentinelEffect
 			switch (layer) {
 				case AbilityAddingRemovingEffects_6:
 					if (sublayer == SubLayer.NA) {
-						for (Ability ability: permanent.getAbilities()) {
-							if (ability.getId().equals(DefenderAbility.getInstance().getId()))
-								permanent.getAbilities().remove(ability);
+						for (Iterator<Ability> i = permanent.getAbilities().iterator(); i.hasNext();) {
+							Ability entry = i.next();
+							if (entry.getId().equals(DefenderAbility.getInstance().getId()))
+								i.remove();
 						}
 						permanent.getAbilities().add(FlyingAbility.getInstance());
 					}
diff --git a/Mage/src/mage/abilities/effects/RedirectionEffect.java b/Mage/src/mage/abilities/effects/RedirectionEffect.java
index 856ceabbd4..a3ace22334 100644
--- a/Mage/src/mage/abilities/effects/RedirectionEffect.java
+++ b/Mage/src/mage/abilities/effects/RedirectionEffect.java
@@ -71,7 +71,7 @@ public abstract class RedirectionEffect<T extends RedirectionEffect<T>> extends
 		DamageEvent damageEvent = (DamageEvent)event;
 		Permanent permanent = game.getPermanent(redirectTarget.getFirstTarget());
 		Ability damageSource = getSource(damageEvent.getSourceId(), game);
-		if (permanent != null) {
+		if (permanent != null && damageSource != null) {
 			permanent.damage(damageEvent.getAmount(), damageSource.getId(), game, damageEvent.isPreventable(), damageEvent.isCombatDamage());
 			return true;
 		}
diff --git a/Mage/src/mage/abilities/effects/common/DestroyTargetEffect.java b/Mage/src/mage/abilities/effects/common/DestroyTargetEffect.java
index 1e60a0d79b..f6b4fb8fca 100644
--- a/Mage/src/mage/abilities/effects/common/DestroyTargetEffect.java
+++ b/Mage/src/mage/abilities/effects/common/DestroyTargetEffect.java
@@ -67,13 +67,15 @@ public class DestroyTargetEffect extends OneShotEffect<DestroyTargetEffect> {
 	@Override
 	public boolean apply(Game game, Ability source) {
         int affectedTargets = 0;
-        for (UUID permanentId : source.getTargets().get(0).getTargets()) {
-            Permanent permanent = game.getPermanent(permanentId);
-            if (permanent != null) {
-			    permanent.destroy(source.getId(), game, noRegen);
-                affectedTargets++;
-            }
-        }
+		if (source.getTargets().size() > 0) {
+			for (UUID permanentId : source.getTargets().get(0).getTargets()) {
+				Permanent permanent = game.getPermanent(permanentId);
+				if (permanent != null) {
+					permanent.destroy(source.getId(), game, noRegen);
+					affectedTargets++;
+				}
+			}
+		}
 		return affectedTargets > 0;
 	}
 
diff --git a/Mage/src/mage/abilities/effects/common/ReturnToHandTargetEffect.java b/Mage/src/mage/abilities/effects/common/ReturnToHandTargetEffect.java
index 88326bcf15..ff73283bdc 100644
--- a/Mage/src/mage/abilities/effects/common/ReturnToHandTargetEffect.java
+++ b/Mage/src/mage/abilities/effects/common/ReturnToHandTargetEffect.java
@@ -58,19 +58,21 @@ public class ReturnToHandTargetEffect extends OneShotEffect<ReturnToHandTargetEf
 
 	@Override
 	public boolean apply(Game game, Ability source) {
-		switch (source.getTargets().get(0).getZone()) {
-			case BATTLEFIELD:
-				Permanent permanent = game.getPermanent(source.getFirstTarget());
-				if (permanent != null) {
-					return permanent.moveToZone(Zone.HAND, source.getId(), game, false);
-				}
-				break;
-			case GRAVEYARD:
-				Card card = game.getCard(source.getFirstTarget());
-				if (card != null) {
-					return card.moveToZone(Zone.HAND, source.getId(), game, true);
-				}
-				break;
+		if (source.getTargets().size() > 0) {
+			switch (source.getTargets().get(0).getZone()) {
+				case BATTLEFIELD:
+					Permanent permanent = game.getPermanent(source.getFirstTarget());
+					if (permanent != null) {
+						return permanent.moveToZone(Zone.HAND, source.getId(), game, false);
+					}
+					break;
+				case GRAVEYARD:
+					Card card = game.getCard(source.getFirstTarget());
+					if (card != null) {
+						return card.moveToZone(Zone.HAND, source.getId(), game, true);
+					}
+					break;
+			}
 		}
 		return false;
 	}
diff --git a/Mage/src/mage/abilities/effects/common/continious/BoostPowerXSourceEffect.java b/Mage/src/mage/abilities/effects/common/continious/BoostPowerXSourceEffect.java
index dd6e98d3b5..68945df9c7 100644
--- a/Mage/src/mage/abilities/effects/common/continious/BoostPowerXSourceEffect.java
+++ b/Mage/src/mage/abilities/effects/common/continious/BoostPowerXSourceEffect.java
@@ -63,14 +63,16 @@ public class BoostPowerXSourceEffect extends ContinuousEffectImpl<BoostPowerXSou
 
 	@Override
 	public boolean apply(Game game, Ability source) {
-		int amount = source.getManaCostsToPay().getVariableCosts().get(0).getAmount();
-		if (amount == 0) {
-			return false;
-		}
-		Permanent target = (Permanent) game.getPermanent(source.getSourceId());
-		if (target != null) {
-			target.addPower(amount);
-			return true;
+		if (source.getManaCostsToPay().getVariableCosts().size() > 0) {
+			int amountX = source.getManaCostsToPay().getVariableCosts().get(0).getAmount();
+			if (amountX == 0) {
+				return false;
+			}
+			Permanent target = (Permanent) game.getPermanent(source.getSourceId());
+			if (target != null) {
+				target.addPower(amountX);
+				return true;
+			}
 		}
 		return false;
 	}
diff --git a/Mage/src/mage/game/GameState.java b/Mage/src/mage/game/GameState.java
index 92604cb294..816575244c 100644
--- a/Mage/src/mage/game/GameState.java
+++ b/Mage/src/mage/game/GameState.java
@@ -318,7 +318,7 @@ public class GameState implements Serializable, Copyable<GameState> {
 			//TODO: this is awkward - improve
 			if (event.getType() == EventType.ZONE_CHANGE) {
 				ZoneChangeEvent zEvent = (ZoneChangeEvent)event;
-				if (zEvent.getFromZone() == Zone.BATTLEFIELD) {
+				if (zEvent.getFromZone() == Zone.BATTLEFIELD && zEvent.getTarget() != null) {
 					if (zEvent.getTarget() instanceof PermanentCard) {
 						((PermanentCard)zEvent.getTarget()).checkPermanentOnlyTriggers(zEvent, game);
 					}