Implemented Kaya's Ghostform

Mage.Sets/src/mage/cards/k/KayasGhostform.java

@@ -0,0 +1,112 @@
+package mage.cards.k;
+
+import mage.abilities.Ability;
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.effects.common.AttachEffect;
+import mage.abilities.effects.common.ReturnToBattlefieldUnderYourControlAttachedEffect;
+import mage.abilities.keyword.EnchantAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.filter.FilterPermanent;
+import mage.filter.common.FilterCreatureOrPlaneswalkerPermanent;
+import mage.filter.predicate.permanent.ControllerPredicate;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.events.ZoneChangeEvent;
+import mage.game.permanent.Permanent;
+import mage.target.TargetPermanent;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class KayasGhostform extends CardImpl {
+
+    private static final FilterPermanent filter
+            = new FilterCreatureOrPlaneswalkerPermanent("creature or planeswalker you control");
+
+    static {
+        filter.add(new ControllerPredicate(TargetController.YOU));
+    }
+
+    public KayasGhostform(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{B}");
+
+        this.subtype.add(SubType.AURA);
+
+        // Enchant creature or planeswalker you control
+        TargetPermanent auraTarget = new TargetPermanent(filter);
+        this.getSpellAbility().addTarget(auraTarget);
+        this.getSpellAbility().addEffect(new AttachEffect(Outcome.BoostCreature));
+        Ability ability = new EnchantAbility(auraTarget.getTargetName());
+        this.addAbility(ability);
+
+        // When enchanted permanent dies or is put into exile, return that card to the battlefield under your control.
+        this.addAbility(new KayasGhostformTriggeredAbility());
+    }
+
+    private KayasGhostform(final KayasGhostform card) {
+        super(card);
+    }
+
+    @Override
+    public KayasGhostform copy() {
+        return new KayasGhostform(this);
+    }
+}
+
+class KayasGhostformTriggeredAbility extends TriggeredAbilityImpl {
+
+    KayasGhostformTriggeredAbility() {
+        super(Zone.ALL, new ReturnToBattlefieldUnderYourControlAttachedEffect(), false);
+    }
+
+    private KayasGhostformTriggeredAbility(final KayasGhostformTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public KayasGhostformTriggeredAbility copy() {
+        return new KayasGhostformTriggeredAbility(this);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.ZONE_CHANGE;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        ZoneChangeEvent zEvent = (ZoneChangeEvent) event;
+        if (zEvent.getFromZone() != Zone.BATTLEFIELD
+                || !(zEvent.getToZone() == Zone.GRAVEYARD || zEvent.getToZone() == Zone.EXILED)) {
+            return false;
+        }
+        if (zEvent.getTarget() != null && zEvent.getTarget().getAttachments() != null
+                && zEvent.getTarget().getAttachments().contains(this.getSourceId())) {
+            return true;
+        } else {
+            // If both (attachment and attached went to graveyard at the same time, the attachemnets can be already removed from the attached object.)
+            // So check here with the LKI of the enchantment
+            Permanent attachment = game.getPermanentOrLKIBattlefield(getSourceId());
+            if (attachment != null
+                    && zEvent.getTargetId() != null && attachment.getAttachedTo() != null
+                    && zEvent.getTargetId().equals(attachment.getAttachedTo())) {
+                Permanent attachedTo = game.getPermanentOrLKIBattlefield(attachment.getAttachedTo());
+                if (attachedTo != null
+                        && attachment.getAttachedToZoneChangeCounter() == attachedTo.getZoneChangeCounter(game)) {  // zoneChangeCounter is stored in Permanent
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public String getRule() {
+        return "When enchanted permanent dies or is put into exile, " +
+                "return that card to the battlefield under your control.";
+    }
+}

Mage.Sets/src/mage/sets/WarOfTheSpark.java

@@ -78,6 +78,7 @@ public final class WarOfTheSpark extends ExpansionSet {
         cards.add(new SetCardInfo("Jace, Wielder of Mysteries", 54, Rarity.RARE, mage.cards.j.JaceWielderOfMysteries.class));
         cards.add(new SetCardInfo("Jiang Yanggu, Wildcrafter", 164, Rarity.UNCOMMON, mage.cards.j.JiangYangguWildcrafter.class));
         cards.add(new SetCardInfo("Karn's Bastion", 248, Rarity.RARE, mage.cards.k.KarnsBastion.class));
+        cards.add(new SetCardInfo("Kaya's Ghostform", 94, Rarity.COMMON, mage.cards.k.KayasGhostform.class));
         cards.add(new SetCardInfo("Kaya, Bane of the Dead", 231, Rarity.UNCOMMON, mage.cards.k.KayaBaneOfTheDead.class));
         cards.add(new SetCardInfo("Kiora's Dambreaker", 58, Rarity.COMMON, mage.cards.k.KiorasDambreaker.class));
         cards.add(new SetCardInfo("Kiora, Behemoth Beckoner", 232, Rarity.UNCOMMON, mage.cards.k.KioraBehemothBeckoner.class));