Implemented Frontier Warmonger

Mage.Sets/src/mage/cards/f/FrontierWarmonger.java

@@ -0,0 +1,96 @@
+package mage.cards.f;
+
+import mage.MageInt;
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.effects.common.continuous.GainAbilityTargetEffect;
+import mage.abilities.keyword.MenaceAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.SubType;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+import mage.target.targetpointer.FixedTargets;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+/**
+ * @author TheElk801
+ */
+public final class FrontierWarmonger extends CardImpl {
+
+    public FrontierWarmonger(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{3}{R}");
+
+        this.subtype.add(SubType.HUMAN);
+        this.subtype.add(SubType.WARRIOR);
+        this.power = new MageInt(4);
+        this.toughness = new MageInt(4);
+
+        // Whenever one or more creatures attack an opponent or a planeswalker an opponent controls, those creatures gain menace until end of turn.
+        this.addAbility(new FrontierWarmongerTriggeredAbility());
+    }
+
+    private FrontierWarmonger(final FrontierWarmonger card) {
+        super(card);
+    }
+
+    @Override
+    public FrontierWarmonger copy() {
+        return new FrontierWarmonger(this);
+    }
+}
+
+class FrontierWarmongerTriggeredAbility extends TriggeredAbilityImpl {
+
+    FrontierWarmongerTriggeredAbility() {
+        super(Zone.BATTLEFIELD, new GainAbilityTargetEffect(new MenaceAbility(), Duration.EndOfTurn), false);
+    }
+
+    private FrontierWarmongerTriggeredAbility(final FrontierWarmongerTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public FrontierWarmongerTriggeredAbility copy() {
+        return new FrontierWarmongerTriggeredAbility(this);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.DECLARED_ATTACKERS;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        Set<UUID> opponents = game.getOpponents(this.getControllerId());
+        Predicate<UUID> predicate = uuid -> opponents.contains(game.getCombat().getDefendingPlayerId(uuid, game));
+        if (game.getCombat().getAttackers().stream().noneMatch(predicate)) {
+            return false;
+        }
+        List<Permanent> permanents = game
+                .getCombat()
+                .getAttackers()
+                .stream()
+                .filter(predicate)
+                .map(game::getPermanent)
+                .filter(Objects::nonNull)
+                .collect(Collectors.toList());
+        this.getEffects().setTargetPointer(new FixedTargets(permanents, game));
+        return true;
+    }
+
+    @Override
+    public String getRule() {
+        return "Whenever one or more creatures attack an opponent or a planeswalker an opponent controls, " +
+                "those creatures gain menace until end of turn.";
+    }
+}

Mage.Sets/src/mage/sets/Commander2020Edition.java

@@ -136,6 +136,7 @@ public final class Commander2020Edition extends ExpansionSet {
         cards.add(new SetCardInfo("Forgotten Cave", 274, Rarity.UNCOMMON, mage.cards.f.ForgottenCave.class));
         cards.add(new SetCardInfo("Frantic Search", 111, Rarity.COMMON, mage.cards.f.FranticSearch.class));
         cards.add(new SetCardInfo("Frontier Bivouac", 275, Rarity.UNCOMMON, mage.cards.f.FrontierBivouac.class));
+        cards.add(new SetCardInfo("Frontier Warmonger", 52, Rarity.RARE, mage.cards.f.FrontierWarmonger.class));
         cards.add(new SetCardInfo("Frontline Medic", 89, Rarity.RARE, mage.cards.f.FrontlineMedic.class));
         cards.add(new SetCardInfo("Fumiko the Lowblood", 152, Rarity.RARE, mage.cards.f.FumikoTheLowblood.class));
         cards.add(new SetCardInfo("Garna, the Bloodflame", 213, Rarity.UNCOMMON, mage.cards.g.GarnaTheBloodflame.class));