[TLA] Implement Trusty Boomerang

Mage.Sets/src/mage/cards/t/TrustyBoomerang.java

@@ -0,0 +1,91 @@
+package mage.cards.t;
+
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.Mode;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.costs.common.TapSourceCost;
+import mage.abilities.costs.mana.GenericManaCost;
+import mage.abilities.effects.Effects;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.ReturnToHandTargetEffect;
+import mage.abilities.effects.common.continuous.GainAbilityWithAttachmentEffect;
+import mage.abilities.keyword.EquipAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+import mage.target.Targets;
+import mage.target.common.TargetCreaturePermanent;
+
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class TrustyBoomerang extends CardImpl {
+
+    public TrustyBoomerang(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ARTIFACT}, "{1}");
+
+        this.subtype.add(SubType.EQUIPMENT);
+
+        // Equipped creature has "{1}, {T}: Tap target creature. Return Trusty Boomerang to its owner's hand."
+        this.addAbility(new SimpleStaticAbility(new GainAbilityWithAttachmentEffect(
+                "equipped creature has \"{1}, {T}: Tap target creature. Return {this} to its owner's hand.\"",
+                new Effects(new ReturnToHandTargetEffect(), new TrustyBoomerangEffect()),
+                new Targets(new TargetCreaturePermanent()), null,
+                new GenericManaCost(1), new TapSourceCost()
+        )));
+
+        // Equip {1}
+        this.addAbility(new EquipAbility(1));
+    }
+
+    private TrustyBoomerang(final TrustyBoomerang card) {
+        super(card);
+    }
+
+    @Override
+    public TrustyBoomerang copy() {
+        return new TrustyBoomerang(this);
+    }
+}
+
+class TrustyBoomerangEffect extends OneShotEffect {
+
+    TrustyBoomerangEffect() {
+        super(Outcome.Benefit);
+    }
+
+    private TrustyBoomerangEffect(final TrustyBoomerangEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public TrustyBoomerangEffect copy() {
+        return new TrustyBoomerangEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        Permanent permanent = (Permanent) getValue("attachedPermanent");
+        return player != null && permanent != null && player.moveCards(permanent, Zone.HAND, source, game);
+    }
+
+    @Override
+    public String getText(Mode mode) {
+        return "return " +
+                Optional.ofNullable((Permanent) getValue("attachedPermanent"))
+                        .map(MageObject::getName)
+                        .orElse("Trusty Boomerang") +
+                " to its owner's hand";
+    }
+}

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

@@ -376,6 +376,7 @@ public final class AvatarTheLastAirbender extends ExpansionSet {
         cards.add(new SetCardInfo("Toph, the First Metalbender", 362, Rarity.RARE, mage.cards.t.TophTheFirstMetalbender.class, NON_FULL_USE_VARIOUS));
         cards.add(new SetCardInfo("Treetop Freedom Fighters", 156, Rarity.COMMON, mage.cards.t.TreetopFreedomFighters.class));
         cards.add(new SetCardInfo("True Ancestry", 199, Rarity.UNCOMMON, mage.cards.t.TrueAncestry.class));
+        cards.add(new SetCardInfo("Trusty Boomerang", 260, Rarity.UNCOMMON, mage.cards.t.TrustyBoomerang.class));
         cards.add(new SetCardInfo("Tundra Tank", 121, Rarity.UNCOMMON, mage.cards.t.TundraTank.class));
         cards.add(new SetCardInfo("Turtle-Duck", 200, Rarity.COMMON, mage.cards.t.TurtleDuck.class));
         cards.add(new SetCardInfo("Twin Blades", 157, Rarity.UNCOMMON, mage.cards.t.TwinBlades.class));

Mage/src/main/java/mage/abilities/effects/common/continuous/GainAbilityWithAttachmentEffect.java

@@ -122,7 +122,7 @@ public class GainAbilityWithAttachmentEffect extends ContinuousEffectImpl {
             }
             ability.addCost(cost.copy());
         }
-        if (source != null && game != null) {
+        if (source != null && game != null && useAttachedCost != null) {
             ability.addCost(useAttachedCost.copy().setMageObjectReference(source, game));
         }
         if (consumer != null) {