Minor changes to Dreamborn Muse.

Mage.Sets/src/mage/sets/legions/DreambornMuse.java

@@ -50,10 +50,9 @@ public class DreambornMuse extends CardImpl {
         this.power = new MageInt(2);
         this.toughness = new MageInt(2);
         
+        // At the beginning of each player's upkeep, that player puts the top X cards of his or her library into his or her graveyard, where X is the number of cards in his or her hand.
         PutLibraryIntoGraveTargetEffect effect = new PutLibraryIntoGraveTargetEffect(new CardsInTargetPlayerHandCount());
         effect.setText("that player puts the top X cards of his or her library into his or her graveyard, where X is the number of cards in his or her hand.");
-
-        // At the beginning of each player's upkeep, that player puts the top X cards of his or her library into his or her graveyard, where X is the number of cards in his or her hand.
         this.addAbility(new BeginningOfUpkeepTriggeredAbility(effect, TargetController.ANY, false));
         
     }

Mage/src/mage/abilities/dynamicvalue/common/CardsInTargetPlayerHandCount.java

@@ -15,7 +15,10 @@ public class CardsInTargetPlayerHandCount implements DynamicValue {
     @Override
     public int calculate(Game game, Ability sourceAbility, Effect effect) {
         Player player = game.getPlayer(effect.getTargetPointer().getFirst(game, sourceAbility));
-        return player.getHand().size();
+        if (player != null) {
+            return player.getHand().size();
+        }
+        return 0;
     }
 
     @Override