* Fixed a bug that the AI did not handle to target a card in its hand (e.g. Chrome Mox).

Mage.Server.Plugins/Mage.Player.AI/src/main/java/mage/player/ai/ComputerPlayer.java

@@ -322,9 +322,10 @@ public class ComputerPlayer extends PlayerImpl implements Player {
             return target.isChosen();
         }
 
-        if (target instanceof TargetCardInHand) {
+        if (target instanceof TargetCardInHand
+                || (target.getZone().equals(Zone.HAND) && (target instanceof TargetCard))) {
             List<Card> cards = new ArrayList<>();
-            for (UUID cardId : ((TargetCardInHand) target).possibleTargets(sourceId, this.getId(), game)) {
+            for (UUID cardId : target.possibleTargets(sourceId, this.getId(), game)) {
                 Card card = game.getCard(cardId);
                 if (card != null) {
                     cards.add(card);

Mage.Sets/src/mage/sets/mirrodin/ChromeMox.java

@@ -29,6 +29,7 @@ package mage.sets.mirrodin;
 
 import java.util.List;
 import java.util.UUID;
+import mage.MageObject;
 import mage.Mana;
 import mage.ObjectColor;
 import mage.abilities.Ability;
@@ -52,6 +53,8 @@ import mage.game.Game;
 import mage.game.permanent.Permanent;
 import mage.players.Player;
 import mage.target.TargetCard;
+import mage.util.CardUtil;
+import mage.util.GameLog;
 
 /**
  *
@@ -82,9 +85,11 @@ public class ChromeMox extends CardImpl {
 class ChromeMoxEffect extends OneShotEffect {
 
     private static final FilterCard filter = new FilterCard("nonartifact, nonland card");
+
     static {
         filter.add(Predicates.not(Predicates.or(new CardTypePredicate(CardType.LAND), new CardTypePredicate(CardType.ARTIFACT))));
     }
+
     public ChromeMoxEffect() {
         super(Outcome.Benefit);
         staticText = "exile a nonartifact, nonland card from your hand";
@@ -96,21 +101,29 @@ class ChromeMoxEffect extends OneShotEffect {
 
     @java.lang.Override
     public boolean apply(Game game, Ability source) {
-        Player player = game.getPlayer(source.getControllerId());
-        if (player.getHand().size() > 0) {
+        Player controller = game.getPlayer(source.getControllerId());
+        MageObject sourceObject = source.getSourceObject(game);
+        if (controller != null && sourceObject != null) {
             TargetCard target = new TargetCard(Zone.HAND, filter);
-            player.choose(Outcome.Benefit, target, source.getSourceId(), game);
-            Card card = player.getHand().get(target.getFirstTarget(), game);
-            if (card != null) {
-                card.moveToExile(getId(), "Chrome Mox (Imprint)", source.getSourceId(), game);
-                Permanent permanent = game.getPermanent(source.getSourceId());
-                if (permanent != null) {
-                    permanent.imprint(card.getId(), game);
-                }
-                return true;
+            target.setNotTarget(true);
+            Card cardToImprint = null;
+            Permanent sourcePermanent = game.getPermanent(source.getSourceId());
+            if (controller.getHand().size() > 0 && controller.choose(Outcome.Benefit, target, source.getSourceId(), game)) {
+                cardToImprint = controller.getHand().get(target.getFirstTarget(), game);
             }
+            if (sourcePermanent != null) {
+                if (cardToImprint != null) {
+                    controller.moveCardsToExile(cardToImprint, source, game, true, source.getSourceId(), sourceObject.getIdName() + " (Imprint)");
+                    sourcePermanent.imprint(cardToImprint.getId(), game);
+                    sourcePermanent.addInfo("imprint", CardUtil.addToolTipMarkTags("[Imprinted card - " + GameLog.getColoredObjectIdNameForTooltip(cardToImprint) + "]"), game);
+                } else {
+                    sourcePermanent.addInfo("imprint", CardUtil.addToolTipMarkTags("[Imprinted card - None]"), game);
+                }
+            }
+            return true;
+
         }
-        return true;
+        return false;
     }
 
     @java.lang.Override
@@ -118,12 +131,10 @@ class ChromeMoxEffect extends OneShotEffect {
         return new ChromeMoxEffect(this);
     }
 
-
 }
 
 class ChromeMoxManaEffect extends ManaEffect {
 
-
     ChromeMoxManaEffect() {
         super();
         staticText = "Add one mana of any of the exiled card's colors to your mana pool";
@@ -133,8 +144,6 @@ class ChromeMoxManaEffect extends ManaEffect {
         super(effect);
     }
 
-
-
     @java.lang.Override
     public ChromeMoxManaEffect copy() {
         return new ChromeMoxManaEffect(this);
@@ -202,4 +211,4 @@ class ChromeMoxManaEffect extends ManaEffect {
         return null;
     }
 
-}
+}

Mage/src/mage/abilities/effects/common/ChooseModeEffect.java

@@ -84,7 +84,7 @@ public class ChooseModeEffect extends OneShotEffect {
             }
             if (choice.isChosen()) {
                 if (!game.isSimulation()) {
-                    game.informPlayers(new StringBuilder(sourcePermanent.getLogName()).append(": ").append(controller.getLogName()).append(" has chosen ").append(choice.getChoice()).toString());
+                    game.informPlayers(sourcePermanent.getLogName() + ": " + controller.getLogName() + " has chosen " + choice.getChoice());
                 }
                 game.getState().setValue(source.getSourceId() + "_modeChoice", choice.getChoice());
                 sourcePermanent.addInfo("_modeChoice", "<font color = 'blue'>Chosen mode: " + choice.getChoice() + "</font>", game);