[CLU] Implement Undercover Butler (#11699)

Co-authored-by: Matthew Wilson <matthew_w@vaadin.com>

Mage.Sets/src/mage/cards/u/UndercoverButler.java

@@ -0,0 +1,84 @@
+package mage.cards.u;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.effects.common.combat.CantBeBlockedSourceEffect;
+import mage.constants.Duration;
+import mage.constants.SubType;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Zone;
+import mage.filter.predicate.ObjectSourcePlayer;
+import mage.filter.predicate.other.PlayerWithTheMostLifePredicate;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.players.Player;
+
+/**
+ * Undercover Butler {2}{U/B}
+ * Creature - Human Rogue 2/3
+ * Whenever Undercover Butler attacks the player with the most life or tied for most life, it can't be blocked this turn.
+ *
+ * @author DominionSpy
+ */
+public final class UndercoverButler extends CardImpl {
+
+    public UndercoverButler(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{2}{U/B}");
+
+        this.subtype.add(SubType.HUMAN);
+        this.subtype.add(SubType.ROGUE);
+        this.power = new MageInt(2);
+        this.toughness = new MageInt(3);
+
+        // Whenever Undercover Butler attacks the player with the most life or tied for most life, it can't be blocked this turn.
+        this.addAbility(new UndercoverButlerAbility().withRuleTextReplacement(true));
+    }
+
+    private UndercoverButler(final UndercoverButler card) {
+        super(card);
+    }
+
+    @Override
+    public UndercoverButler copy() {
+        return new UndercoverButler(this);
+    }
+}
+
+class UndercoverButlerAbility extends TriggeredAbilityImpl {
+
+    UndercoverButlerAbility() {
+        super(Zone.BATTLEFIELD, new CantBeBlockedSourceEffect(Duration.EndOfTurn), false);
+        setTriggerPhrase("Whenever {this} attacks the player with the most life or tied for the most life, ");
+    }
+
+    private UndercoverButlerAbility(final UndercoverButlerAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public UndercoverButlerAbility copy() {
+        return new UndercoverButlerAbility(this);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.DECLARED_ATTACKERS;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        UUID defenderId = game.getCombat().getDefenderId(getSourceId());
+        if (defenderId == null) {
+            return false;
+        }
+
+        Player attackedPlayer = game.getPlayer(defenderId);
+        return PlayerWithTheMostLifePredicate.instance.apply(
+                new ObjectSourcePlayer<>(attackedPlayer, getControllerId(), null),
+                game
+        );
+    }
+}

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

@@ -29,5 +29,6 @@ public final class RavnicaClueEdition extends ExpansionSet {
         cards.add(new SetCardInfo("Library", 18, Rarity.UNCOMMON, mage.cards.l.Library.class));
         cards.add(new SetCardInfo("Senator Peacock", 2, Rarity.RARE, mage.cards.s.SenatorPeacock.class));
         cards.add(new SetCardInfo("Steam Vents", 280, Rarity.RARE, mage.cards.s.SteamVents.class));
+        cards.add(new SetCardInfo("Undercover Butler", 49, Rarity.UNCOMMON, mage.cards.u.UndercoverButler.class));
     }
 }