Implemented Stormwing Entity

Mage.Sets/src/mage/cards/s/StormwingEntity.java

@@ -0,0 +1,109 @@
+package mage.cards.s;
+
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.condition.Condition;
+import mage.abilities.costs.mana.ManaCostsImpl;
+import mage.abilities.effects.common.cost.SpellCostReductionSourceEffect;
+import mage.abilities.effects.keyword.ScryEffect;
+import mage.abilities.hint.ConditionHint;
+import mage.abilities.keyword.FlyingAbility;
+import mage.abilities.keyword.ProwessAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.SubType;
+import mage.constants.WatcherScope;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.stack.Spell;
+import mage.watchers.Watcher;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class StormwingEntity extends CardImpl {
+
+    private static final ConditionHint hint = new ConditionHint(
+            StormwingEntityCondition.instance, "You cast an instant or sorcery spell this turn"
+    );
+
+    public StormwingEntity(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{3}{U}{U}");
+
+        this.subtype.add(SubType.ELEMENTAL);
+        this.power = new MageInt(3);
+        this.toughness = new MageInt(3);
+
+        // This spell costs {2}{U} less to cast if you've cast an instant or sorcery spell this turn.
+        this.addAbility(new SimpleStaticAbility(Zone.STACK, new SpellCostReductionSourceEffect(
+                new ManaCostsImpl("{2}{U}"), StormwingEntityCondition.instance
+        )).setRuleAtTheTop(true).addHint(hint), new StormwingEntityWatcher());
+
+        // Flying
+        this.addAbility(FlyingAbility.getInstance());
+
+        // Prowess
+        this.addAbility(new ProwessAbility());
+
+        // When Stormwing Entity enters the battlefield, scry 2.
+        this.addAbility(new EntersBattlefieldTriggeredAbility(new ScryEffect(2)));
+    }
+
+    private StormwingEntity(final StormwingEntity card) {
+        super(card);
+    }
+
+    @Override
+    public StormwingEntity copy() {
+        return new StormwingEntity(this);
+    }
+}
+
+enum StormwingEntityCondition implements Condition {
+    instance;
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        StormwingEntityWatcher watcher = game.getState().getWatcher(StormwingEntityWatcher.class);
+        return watcher != null && watcher.checkPlayer(source.getControllerId());
+    }
+}
+
+class StormwingEntityWatcher extends Watcher {
+
+    private final Set<UUID> playerMap = new HashSet<>();
+
+    StormwingEntityWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (event.getType() != GameEvent.EventType.SPELL_CAST) {
+            return;
+        }
+        Spell spell = game.getSpell(event.getTargetId());
+        if (spell == null || !spell.isInstantOrSorcery()) {
+            return;
+        }
+        playerMap.add(event.getPlayerId());
+    }
+
+    @Override
+    public void reset() {
+        playerMap.clear();
+        super.reset();
+    }
+
+    boolean checkPlayer(UUID playerId) {
+        return playerMap.contains(playerId);
+    }
+}

Mage.Sets/src/mage/sets/CoreSet2021.java

@@ -128,6 +128,7 @@ public final class CoreSet2021 extends ExpansionSet {
         cards.add(new SetCardInfo("Spined Megalodon", 72, Rarity.COMMON, mage.cards.s.SpinedMegalodon.class));
         cards.add(new SetCardInfo("Spirit of Malevolence", 331, Rarity.COMMON, mage.cards.s.SpiritOfMalevolence.class));
         cards.add(new SetCardInfo("Storm Caller", 335, Rarity.COMMON, mage.cards.s.StormCaller.class));
+        cards.add(new SetCardInfo("Stormwing Entity", 73, Rarity.RARE, mage.cards.s.StormwingEntity.class));
         cards.add(new SetCardInfo("Swamp", 311, Rarity.LAND, mage.cards.basiclands.Swamp.class, NON_FULL_USE_VARIOUS));
         cards.add(new SetCardInfo("Teferi's Ageless Insight", 76, Rarity.RARE, mage.cards.t.TeferisAgelessInsight.class));
         cards.add(new SetCardInfo("Teferi's Protege", 77, Rarity.COMMON, mage.cards.t.TeferisProtege.class));