diff --git a/Mage.Sets/src/mage/sets/dragonsoftarkir/LurkingArynx.java b/Mage.Sets/src/mage/sets/dragonsoftarkir/LurkingArynx.java
index 02ec94552f..76ba422027 100644
--- a/Mage.Sets/src/mage/sets/dragonsoftarkir/LurkingArynx.java
+++ b/Mage.Sets/src/mage/sets/dragonsoftarkir/LurkingArynx.java
@@ -40,6 +40,7 @@ import mage.constants.CardType;
 import mage.constants.Duration;
 import mage.constants.Rarity;
 import mage.constants.Zone;
+import mage.target.common.TargetCreaturePermanent;
 
 /**
  *
@@ -62,6 +63,7 @@ public class LurkingArynx extends CardImpl {
                 new ManaCostsImpl("{2}{G}"),
                 FormidableCondition.getInstance());
         ability.setAbilityWord(AbilityWord.FORMIDABLE);
+        ability.addTarget(new TargetCreaturePermanent());
         this.addAbility(ability);
     }
 
diff --git a/Mage/src/mage/abilities/effects/common/combat/MustBeBlockedByTargetSourceEffect.java b/Mage/src/mage/abilities/effects/common/combat/MustBeBlockedByTargetSourceEffect.java
index 16966be715..ad1244d1b8 100644
--- a/Mage/src/mage/abilities/effects/common/combat/MustBeBlockedByTargetSourceEffect.java
+++ b/Mage/src/mage/abilities/effects/common/combat/MustBeBlockedByTargetSourceEffect.java
@@ -60,7 +60,7 @@ public class MustBeBlockedByTargetSourceEffect extends RequirementEffect {
         if (permanent.getId().equals(this.getTargetPointer().getFirst(game, source))) {
             Permanent blocker = game.getPermanent(this.getTargetPointer().getFirst(game, source));
             if (blocker != null && blocker.canBlock(source.getSourceId(), game)) {              
-                Permanent attacker = game.getPermanent(source.getSourceId());
+                Permanent attacker = (Permanent) source.getSourceObjectIfItStillExists(game);
                 if (attacker != null) {
                     BlockedAttackerWatcher blockedAttackerWatcher = (BlockedAttackerWatcher) game.getState().getWatchers().get("BlockedAttackerWatcher");
                     if (blockedAttackerWatcher != null && blockedAttackerWatcher.creatureHasBlockedAttacker(attacker, blocker, game)) {
@@ -68,6 +68,8 @@ public class MustBeBlockedByTargetSourceEffect extends RequirementEffect {
                         return false;
                     }                
                     return true;
+                } else {
+                    discard();
                 }
             }
         }