[J22] Implement Ashcoat of the Shadow Swarm (#9771)

* [J22] Implement Ashcoat of the Shadow Swarm

* Improve Ashcoat end of turn ability

* Fix Ashcoat filter in custom effect

* Implement requested changes

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

@@ -0,0 +1,106 @@
+package mage.cards.a;
+
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.common.AttacksOrBlocksTriggeredAbility;
+import mage.abilities.common.BeginningOfEndStepTriggeredAbility;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.dynamicvalue.common.PermanentsOnBattlefieldCount;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.MillCardsControllerEffect;
+import mage.abilities.effects.common.continuous.BoostControlledEffect;
+import mage.abilities.hint.Hint;
+import mage.abilities.hint.ValueHint;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.cards.CardsImpl;
+import mage.constants.*;
+import mage.filter.common.FilterCreatureCard;
+import mage.filter.common.FilterCreaturePermanent;
+import mage.game.Game;
+import mage.players.Player;
+import mage.target.TargetCard;
+import mage.target.common.TargetCardInYourGraveyard;
+
+import java.util.UUID;
+
+/**
+ * @author PurpleCrowbar
+ */
+public final class AshcoatOfTheShadowSwarm extends CardImpl {
+
+    private static final FilterCreaturePermanent filter = new FilterCreaturePermanent(SubType.RAT, "Rats you control");
+    private static final DynamicValue xValue = new PermanentsOnBattlefieldCount(filter, null);
+    private static final Hint hint = new ValueHint(
+            "Number of Rats you control", xValue
+    );
+
+    static {
+        filter.add(TargetController.YOU.getControllerPredicate());
+    }
+
+    public AshcoatOfTheShadowSwarm(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{3}{B}");
+        addSuperType(SuperType.LEGENDARY);
+        this.subtype.add(SubType.RAT, SubType.WARLOCK);
+        this.power = new MageInt(3);
+        this.toughness = new MageInt(4);
+
+        // Whenever Ashcoat of the Shadow Swarm attacks or blocks, other Rats you control
+        // get +X/+X until end of turn, where X is the number of Rats you control.
+        this.addAbility(new AttacksOrBlocksTriggeredAbility(new BoostControlledEffect(
+                xValue, xValue, Duration.EndOfTurn, filter, true
+        ), false).addHint(hint));
+
+        // At the beginning of your end step, you may mill four cards. If you do,
+        // return up to two Rat creature cards from your graveyard to your hand.
+        Ability ability =  new BeginningOfEndStepTriggeredAbility(new MillCardsControllerEffect(4),
+                TargetController.YOU, true);
+        ability.addEffect(new AshcoatEffect());
+        this.addAbility(ability);
+    }
+
+    private AshcoatOfTheShadowSwarm(final AshcoatOfTheShadowSwarm card) {
+        super(card);
+    }
+
+    @Override
+    public AshcoatOfTheShadowSwarm copy() {
+        return new AshcoatOfTheShadowSwarm(this);
+    }
+}
+
+class AshcoatEffect extends OneShotEffect {
+
+    private static final FilterCreatureCard filter = new FilterCreatureCard("Rat creature cards");
+
+    static {
+        filter.add(SubType.RAT.getPredicate());
+    }
+
+    AshcoatEffect() {
+        super(Outcome.ReturnToHand);
+        staticText = "If you do, return up to two Rat creature cards from your graveyard to your hand.";
+    }
+
+    private AshcoatEffect(final AshcoatEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public AshcoatEffect copy() {
+        return new AshcoatEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        if (player == null) {
+            return false;
+        }
+        TargetCard target = new TargetCardInYourGraveyard(0, 2, filter, true);
+        player.choose(outcome, target, source, game);
+        player.moveCards(new CardsImpl(target.getTargets()), Zone.HAND, source, game);
+        return true;
+    }
+}

Mage.Sets/src/mage/sets/Jumpstart2022.java

@@ -25,6 +25,7 @@ public final class Jumpstart2022 extends ExpansionSet {
         cards.add(new SetCardInfo("Ardoz, Cobbler of War", 29, Rarity.RARE, mage.cards.a.ArdozCobblerOfWar.class));
         cards.add(new SetCardInfo("Arlinn, Voice of the Pack", 85, Rarity.UNCOMMON, mage.cards.a.ArlinnVoiceOfThePack.class));
         cards.add(new SetCardInfo("Arrest", 52, Rarity.UNCOMMON, mage.cards.a.Arrest.class));
+        cards.add(new SetCardInfo("Ashcoat of the Shadow Swarm", 19, Rarity.MYTHIC, mage.cards.a.AshcoatOfTheShadowSwarm.class));
         cards.add(new SetCardInfo("Balan, Wandering Knight", 53, Rarity.RARE, mage.cards.b.BalanWanderingKnight.class));
         cards.add(new SetCardInfo("Biblioplex Kraken", 10, Rarity.UNCOMMON, mage.cards.b.BiblioplexKraken.class));
         cards.add(new SetCardInfo("Blood Artist", 117, Rarity.UNCOMMON, mage.cards.b.BloodArtist.class));