- Workaround for #5437. The delayed triggers work correctly now and the game will no longer freeze. TODO: Cards that are copied and then cast do not retain the correct sourceObject. They instead point to the spell on the stack which fails when delayed triggers are used.

Mage.Sets/src/mage/cards/a/ArcaneDenial.java

@@ -1,4 +1,3 @@
-
 package mage.cards.a;
 
 import java.util.UUID;
@@ -11,6 +10,7 @@ import mage.abilities.effects.OneShotEffect;
 import mage.abilities.effects.common.CreateDelayedTriggeredAbilityEffect;
 import mage.abilities.effects.common.DrawCardSourceControllerEffect;
 import mage.abilities.effects.common.DrawCardTargetEffect;
+import mage.cards.Card;
 import mage.cards.CardImpl;
 import mage.cards.CardSetInfo;
 import mage.constants.CardType;
@@ -29,11 +29,14 @@ public final class ArcaneDenial extends CardImpl {
     public ArcaneDenial(UUID ownerId, CardSetInfo setInfo) {
         super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{1}{U}");
 
-        // Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep.
+        // Counter target spell. Its controller may draw up to two cards at 
+        // the beginning of the next turn's upkeep.
         this.getSpellAbility().addEffect(new ArcaneDenialEffect());
         this.getSpellAbility().addTarget(new TargetSpell());
         // You draw a card at the beginning of the next turn's upkeep.
-        this.getSpellAbility().addEffect(new CreateDelayedTriggeredAbilityEffect(new AtTheBeginOfNextUpkeepDelayedTriggeredAbility(new DrawCardSourceControllerEffect(1)), false));
+        this.getSpellAbility().addEffect(new CreateDelayedTriggeredAbilityEffect(
+                new AtTheBeginOfNextUpkeepDelayedTriggeredAbility(
+                        new DrawCardSourceControllerEffect(1)), false));
     }
 
     public ArcaneDenial(final ArcaneDenial card) {
@@ -50,7 +53,8 @@ class ArcaneDenialEffect extends OneShotEffect {
 
     public ArcaneDenialEffect() {
         super(Outcome.Detriment);
-        staticText = "Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep";
+        staticText = "Counter target spell. Its controller may draw up to two cards "
+                + "at the beginning of the next turn's upkeep";
     }
 
     public ArcaneDenialEffect(final ArcaneDenialEffect effect) {
@@ -64,8 +68,22 @@ class ArcaneDenialEffect extends OneShotEffect {
 
     @Override
     public boolean apply(Game game, Ability source) {
+        Card originalSourceCard; // needed for copies of Arcane Denial See Bug #5437
         Player controller = null;
         boolean countered = false;
+        // If the source originates from a copy (Isochron Scepter for example),
+        // then we set the source's sourceId to the original card, otherwise it 
+        // uses the spell on the stack as its sourceObject which won't work
+        // correctly with any cards that make use of Delayed Triggers.
+        // see Bug #5437
+        Card cardToCheck = game.getCard(source.getSourceId());
+        if (cardToCheck != null
+                && cardToCheck.isCopy()) { // Isochron Scepter imprinted card for example
+            originalSourceCard = (Card) game.getState().getValue("RememberSourceObject" + source.getSourceId());
+            if (originalSourceCard != null) {
+                source.setSourceId(originalSourceCard.getId());
+            }
+        }
         UUID targetId = this.getTargetPointer().getFirst(game, source);
         if (targetId != null) {
             controller = game.getPlayer(game.getControllerId(targetId));

Mage.Sets/src/mage/cards/i/IsochronScepter.java

@@ -143,6 +143,9 @@ class IsochronScepterCopyEffect extends OneShotEffect {
                     if (controller.chooseUse(outcome, "Create a copy of " + imprintedInstant.getName() + '?', source, game)) {
                         Card copiedCard = game.copyCard(imprintedInstant, source, source.getControllerId());
                         if (copiedCard != null) {
+                            // Need to record the sourceObject info for the copy (example Arcane Denial)
+                            // TODO implement this within the codebase.  See Bug #5437
+                            game.getState().setValue("RememberSourceObject" + copiedCard.getId(), imprintedInstant);
                             game.getExile().add(source.getSourceId(), "", copiedCard);
                             game.getState().setZone(copiedCard.getId(), Zone.EXILED);
                             if (controller.chooseUse(outcome, "Cast the copied card without paying mana cost?", source, game)) {

Mage/src/main/java/mage/abilities/effects/common/DrawCardSourceControllerEffect.java

@@ -52,7 +52,8 @@ public class DrawCardSourceControllerEffect extends OneShotEffect {
     @Override
     public boolean apply(Game game, Ability source) {
         Player player = game.getPlayer(source.getControllerId());
-        if (player != null) {
+        if (player != null
+                && player.isInGame()) {
             player.drawCards(amount.calculate(game, source, this), game);
             return true;
         }
@@ -61,9 +62,14 @@ public class DrawCardSourceControllerEffect extends OneShotEffect {
 
     private void setText() {
         StringBuilder sb = new StringBuilder();
-        boolean oneCard = (amount instanceof StaticValue && amount.calculate(null, null, this) == 1)
-                || amount instanceof PermanentsOnBattlefieldCount || amount.toString().equals("1") || amount.toString().equals("a");
-        sb.append(whoDrawCard.isEmpty() ? "" : whoDrawCard + " ").append("draw ").append(oneCard ? "a" : CardUtil.numberToText(amount.toString())).append(" card");
+        boolean oneCard = (amount instanceof StaticValue
+                && amount.calculate(null, null, this) == 1)
+                || amount instanceof PermanentsOnBattlefieldCount
+                || amount.toString().equals("1")
+                || amount.toString().equals("a");
+        sb.append(whoDrawCard.isEmpty() ? "" : whoDrawCard
+                + " ").append("draw ").append(oneCard ? "a"
+                : CardUtil.numberToText(amount.toString())).append(" card");
         if (!oneCard) {
             sb.append('s');
         }

Mage/src/main/java/mage/abilities/effects/common/DrawCardTargetEffect.java

@@ -1,4 +1,3 @@
-
 package mage.abilities.effects.common;
 
 import java.util.UUID;
@@ -63,12 +62,14 @@ public class DrawCardTargetEffect extends OneShotEffect {
     public boolean apply(Game game, Ability source) {
         for (UUID playerId : getTargetPointer().getTargets(game, source)) {
             Player player = game.getPlayer(playerId);
-            if (player != null) {
+            if (player != null
+                    && player.isInGame()) {
                 int cardsToDraw = amount.calculate(game, source, this);
                 if (upTo) {
                     cardsToDraw = player.getAmount(0, cardsToDraw, "Draw how many cards?", game);
                 }
-                if (!optional || player.chooseUse(outcome, "Use draw effect?", source, game)) {
+                if (!optional
+                        || player.chooseUse(outcome, "Use draw effect?", source, game)) {
                     player.drawCards(cardsToDraw, game);
                 }
             }