Implement Metamorphic Alteration

Mage.Sets/src/mage/cards/m/MetamorphicAlteration.java

@@ -0,0 +1,153 @@
+package mage.cards.m;
+
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.common.AsEntersBattlefieldAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.ContinuousEffectImpl;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.AttachEffect;
+import mage.abilities.keyword.EnchantAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+import mage.target.Target;
+import mage.target.TargetPermanent;
+import mage.target.common.TargetCreaturePermanent;
+
+import java.util.UUID;
+
+/**
+ *
+ * @author noahg
+ */
+public final class MetamorphicAlteration extends CardImpl {
+
+    public MetamorphicAlteration(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{1}{U}");
+        
+        this.subtype.add(SubType.AURA);
+
+        // Enchant creature
+        TargetPermanent auraTarget = new TargetCreaturePermanent();
+        this.getSpellAbility().addTarget(auraTarget);
+        this.getSpellAbility().addEffect(new AttachEffect(Outcome.BoostCreature));
+        Ability ability = new EnchantAbility(auraTarget.getTargetName());
+        this.addAbility(ability);
+
+        // As Metamorphic Alteration enters the battlefield, choose a creature.
+        this.addAbility(new AsEntersBattlefieldAbility(new ChooseACreature()));
+
+        // Enchanted creature is a copy of the chosen creature.
+        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new MetamorphicAlterationEffect()));
+    }
+
+    public MetamorphicAlteration(final MetamorphicAlteration card) {
+        super(card);
+    }
+
+    @Override
+    public MetamorphicAlteration copy() {
+        return new MetamorphicAlteration(this);
+    }
+}
+
+class ChooseACreature extends OneShotEffect {
+
+    public static String INFO_KEY = "CHOSEN_CREATURE";
+
+    public ChooseACreature() {
+        super(Outcome.Copy);
+        staticText = "choose a creature";
+    }
+
+    public ChooseACreature(final ChooseACreature effect) {
+        super(effect);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player controller = game.getPlayer(source.getControllerId());
+        MageObject sourceObject = game.getPermanentEntering(source.getSourceId());
+        if (sourceObject == null) {
+            sourceObject = game.getObject(source.getSourceId());
+        }
+        if (controller != null && sourceObject != null) {
+            Target target = new TargetCreaturePermanent();
+            target.setNotTarget(true);
+            if (target.canChoose(source.getSourceId(), controller.getId(), game)) {
+                controller.choose(Outcome.Copy, target, source.getSourceId(), game);
+                Permanent chosenPermanent = game.getPermanent(target.getFirstTarget());
+                game.getState().setValue(source.getSourceId().toString() + INFO_KEY, chosenPermanent.copy());
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public ChooseACreature copy() {
+        return new ChooseACreature(this);
+    }
+}
+
+class MetamorphicAlterationEffect extends ContinuousEffectImpl {
+
+    public MetamorphicAlterationEffect() {
+        super(Duration.WhileOnBattlefield, Layer.CopyEffects_1, SubLayer.NA, Outcome.Copy);
+        this.staticText = "Enchanted creature is a copy of the chosen creature.";
+    }
+
+    public MetamorphicAlterationEffect(MetamorphicAlterationEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public boolean apply(Layer layer, SubLayer sublayer, Ability source, Game game) {
+        //TODO this is stupid and there's got to be a better way, but it works and people probably want to practice full M19 before Prerelease.
+        Permanent enchantment = game.getPermanent(source.getSourceId());
+        Permanent copied = (Permanent) game.getState().getValue(source.getSourceId().toString() + ChooseACreature.INFO_KEY);
+        if (enchantment != null && copied != null) {
+            Permanent permanent = game.getPermanent(enchantment.getAttachedTo());
+            if (permanent != null && layer == Layer.CopyEffects_1) {
+                permanent.setName(copied.getName());
+                permanent.getManaCost().clear();
+                permanent.getManaCost().addAll(copied.getManaCost());
+                permanent.setExpansionSetCode(copied.getExpansionSetCode());
+                permanent.getSuperType().clear();
+                for (SuperType t : copied.getSuperType()) {
+                    permanent.addSuperType(t);
+                }
+                permanent.getCardType().clear();
+                for (CardType t : copied.getCardType()) {
+                    permanent.addCardType(t);
+                }
+                permanent.getSubtype(game).retainAll(SubType.getLandTypes(false));
+                for (SubType t : copied.getSubtype(game)) {
+                    permanent.getSubtype(game).add(t);
+                }
+                permanent.getColor(game).setColor(copied.getColor(game));
+                permanent.removeAllAbilities(source.getSourceId(), game);
+                for (Ability ability : copied.getAbilities()) {
+                    permanent.addAbility(ability, source.getSourceId(), game);
+                }
+                permanent.getPower().setValue(copied.getPower().getValue());
+                permanent.getToughness().setValue(copied.getToughness().getValue());
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return false;
+    }
+
+    @Override
+    public MetamorphicAlterationEffect copy() {
+        return new MetamorphicAlterationEffect(this);
+    }
+}

Mage.Sets/src/mage/sets/CoreSet2019.java

@@ -207,6 +207,7 @@ public final class CoreSet2019 extends ExpansionSet {
         cards.add(new SetCardInfo("Marauder's Axe", 240, Rarity.COMMON, mage.cards.m.MaraudersAxe.class));
         cards.add(new SetCardInfo("Meandering River", 253, Rarity.COMMON, mage.cards.m.MeanderingRiver.class));
         cards.add(new SetCardInfo("Mentor of the Meek", 27, Rarity.RARE, mage.cards.m.MentorOfTheMeek.class));
+        cards.add(new SetCardInfo("Metamorphic Alteration", 60, Rarity.RARE, mage.cards.m.MetamorphicAlteration.class));
         cards.add(new SetCardInfo("Meteor Golem", 241, Rarity.UNCOMMON, mage.cards.m.MeteorGolem.class));
         cards.add(new SetCardInfo("Mighty Leap", 28, Rarity.COMMON, mage.cards.m.MightyLeap.class));
         cards.add(new SetCardInfo("Militia Bugler", 29, Rarity.UNCOMMON, mage.cards.m.MilitiaBugler.class));