[STX] Implemented Maelstrom Muse

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

@@ -0,0 +1,142 @@
+package mage.cards.m;
+
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.SpellAbility;
+import mage.abilities.common.AttacksTriggeredAbility;
+import mage.abilities.effects.common.cost.CostModificationEffectImpl;
+import mage.abilities.keyword.FlyingAbility;
+import mage.cards.Card;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+import mage.game.stack.Spell;
+import mage.util.CardUtil;
+import mage.watchers.Watcher;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class MaelstromMuse extends CardImpl {
+
+    public MaelstromMuse(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{U}{U/R}{R}");
+
+        this.subtype.add(SubType.DJINN);
+        this.subtype.add(SubType.WIZARD);
+        this.power = new MageInt(2);
+        this.toughness = new MageInt(4);
+
+        // Flying
+        this.addAbility(FlyingAbility.getInstance());
+
+        // Whenever Maelstrom Muse attacks, the next instant or sorcery spell you cast this turn costs {X} less to cast, where X is Maelstrom Muse's power as this ability resolves.
+        this.addAbility(new AttacksTriggeredAbility(
+                new MaelstromMuseEffect(), false
+        ), new MaelstromMuseWatcher());
+    }
+
+    private MaelstromMuse(final MaelstromMuse card) {
+        super(card);
+    }
+
+    @Override
+    public MaelstromMuse copy() {
+        return new MaelstromMuse(this);
+    }
+}
+
+class MaelstromMuseEffect extends CostModificationEffectImpl {
+
+    private int spellsCast;
+    private int sourcePower = 0;
+
+    MaelstromMuseEffect() {
+        super(Duration.EndOfTurn, Outcome.Benefit, CostModificationType.REDUCE_COST);
+        staticText = "the next instant or sorcery spell you cast this turn costs {X} less to cast, " +
+                "where X is {this}'s power as this ability resolves";
+    }
+
+    private MaelstromMuseEffect(final MaelstromMuseEffect effect) {
+        super(effect);
+        this.spellsCast = effect.spellsCast;
+        this.sourcePower = effect.sourcePower;
+    }
+
+    @Override
+    public void init(Ability source, Game game) {
+        super.init(source, game);
+        MaelstromMuseWatcher watcher = game.getState().getWatcher(MaelstromMuseWatcher.class);
+        if (watcher != null) {
+            spellsCast = watcher.getCount(source.getControllerId());
+        }
+        Permanent permanent = source.getSourcePermanentOrLKI(game);
+        sourcePower = permanent != null ? Math.max(permanent.getPower().getValue(), 0) : 0;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source, Ability abilityToModify) {
+        CardUtil.reduceCost(abilityToModify, sourcePower);
+        return true;
+    }
+
+    @Override
+    public boolean applies(Ability abilityToModify, Ability source, Game game) {
+        MaelstromMuseWatcher watcher = game.getState().getWatcher(MaelstromMuseWatcher.class);
+        if (watcher == null) {
+            return false;
+        }
+        if (watcher.getCount(source.getControllerId()) > spellsCast) {
+            discard(); // only one use
+            return false;
+        }
+        if (!(abilityToModify instanceof SpellAbility)
+                || !abilityToModify.isControlledBy(source.getControllerId())) {
+            return false;
+        }
+        Card spellCard = ((SpellAbility) abilityToModify).getCharacteristics(game);
+        return spellCard != null && spellCard.isInstantOrSorcery();
+    }
+
+    @Override
+    public MaelstromMuseEffect copy() {
+        return new MaelstromMuseEffect(this);
+    }
+}
+
+class MaelstromMuseWatcher extends Watcher {
+
+    private final Map<UUID, Integer> playerMap = new HashMap<>();
+
+    MaelstromMuseWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (event.getType() != GameEvent.EventType.SPELL_CAST) {
+            return;
+        }
+        Spell spell = game.getSpell(event.getSourceId());
+        if (spell != null && spell.isInstantOrSorcery()) {
+            playerMap.compute(event.getPlayerId(), (u, i) -> i == null ? 1 : Integer.sum(i, 1));
+        }
+    }
+
+    @Override
+    public void reset() {
+        super.reset();
+        playerMap.clear();
+    }
+
+    int getCount(UUID playerId) {
+        return playerMap.getOrDefault(playerId, 0);
+    }
+}

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

@@ -141,6 +141,7 @@ public final class StrixhavenSchoolOfMages extends ExpansionSet {
         cards.add(new SetCardInfo("Lorehold Command", 199, Rarity.RARE, mage.cards.l.LoreholdCommand.class));
         cards.add(new SetCardInfo("Lorehold Excavation", 200, Rarity.UNCOMMON, mage.cards.l.LoreholdExcavation.class));
         cards.add(new SetCardInfo("Lorehold Pledgemage", 201, Rarity.COMMON, mage.cards.l.LoreholdPledgemage.class));
+        cards.add(new SetCardInfo("Maelstrom Muse", 202, Rarity.UNCOMMON, mage.cards.m.MaelstromMuse.class));
         cards.add(new SetCardInfo("Mage Hunter", 76, Rarity.UNCOMMON, mage.cards.m.MageHunter.class));
         cards.add(new SetCardInfo("Mage Hunters' Onslaught", 77, Rarity.COMMON, mage.cards.m.MageHuntersOnslaught.class));
         cards.add(new SetCardInfo("Magma Opus", 203, Rarity.MYTHIC, mage.cards.m.MagmaOpus.class));