[MOM] Implement War Historian

Mage.Sets/src/mage/cards/w/WarHistorian.java

@@ -0,0 +1,108 @@
+package mage.cards.w;
+
+import mage.MageInt;
+import mage.MageObjectReference;
+import mage.abilities.Ability;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.condition.Condition;
+import mage.abilities.decorator.ConditionalContinuousEffect;
+import mage.abilities.effects.common.continuous.GainAbilitySourceEffect;
+import mage.abilities.hint.ConditionHint;
+import mage.abilities.hint.Hint;
+import mage.abilities.keyword.IndestructibleAbility;
+import mage.abilities.keyword.ReachAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.SubType;
+import mage.constants.WatcherScope;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+import mage.watchers.Watcher;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class WarHistorian extends CardImpl {
+
+    public WarHistorian(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{2}{G}");
+
+        this.subtype.add(SubType.HUMAN);
+        this.subtype.add(SubType.MONK);
+        this.power = new MageInt(3);
+        this.toughness = new MageInt(3);
+
+        // Reach
+        this.addAbility(ReachAbility.getInstance());
+
+        // War Historian has indestructible as long as it attacked a battle this turn.
+        this.addAbility(new SimpleStaticAbility(new ConditionalContinuousEffect(
+                new GainAbilitySourceEffect(IndestructibleAbility.getInstance()), WarHistorianCondition.instance,
+                "{this} has indestructible as long as it attacked a battle this turn"
+        )).addHint(WarHistorianCondition.getHint()), new WarHistorianWatcher());
+    }
+
+    private WarHistorian(final WarHistorian card) {
+        super(card);
+    }
+
+    @Override
+    public WarHistorian copy() {
+        return new WarHistorian(this);
+    }
+}
+
+enum WarHistorianCondition implements Condition {
+    instance;
+    private static final Hint hint = new ConditionHint(instance, "Attacked a battle this turn");
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return WarHistorianWatcher.checkPermanent(source, game);
+    }
+
+    public static Hint getHint() {
+        return hint;
+    }
+}
+
+class WarHistorianWatcher extends Watcher {
+
+    private final Set<MageObjectReference> morSet = new HashSet<>();
+
+    WarHistorianWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (event.getType() != GameEvent.EventType.ATTACKER_DECLARED) {
+            return;
+        }
+        Permanent permanent = game.getPermanent(event.getTargetId());
+        if (permanent != null && permanent.isBattle(game)) {
+            morSet.add(new MageObjectReference(event.getSourceId(), game));
+        }
+    }
+
+    @Override
+    public void reset() {
+        super.reset();
+        morSet.clear();
+    }
+
+    static boolean checkPermanent(Ability source, Game game) {
+        return game
+                .getState()
+                .getWatcher(WarHistorianWatcher.class)
+                .morSet
+                .stream()
+                .anyMatch(mor -> mor.refersTo(source.getSourceId(), game));
+    }
+}

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

@@ -135,6 +135,7 @@ public final class MarchOfTheMachine extends ExpansionSet {
         cards.add(new SetCardInfo("Tranquil Cove", 275, Rarity.COMMON, mage.cards.t.TranquilCove.class));
         cards.add(new SetCardInfo("Transcendent Message", 83, Rarity.RARE, mage.cards.t.TranscendentMessage.class));
         cards.add(new SetCardInfo("Voldaren Thrillseeker", 171, Rarity.RARE, mage.cards.v.VoldarenThrillseeker.class));
+        cards.add(new SetCardInfo("War Historian", 214, Rarity.COMMON, mage.cards.w.WarHistorian.class));
         cards.add(new SetCardInfo("Wind-Scarred Crag", 276, Rarity.COMMON, mage.cards.w.WindScarredCrag.class));
         cards.add(new SetCardInfo("Wrenn and Realmbreaker", 217, Rarity.MYTHIC, mage.cards.w.WrennAndRealmbreaker.class));
         cards.add(new SetCardInfo("Xerex Strobe-Knight", 85, Rarity.UNCOMMON, mage.cards.x.XerexStrobeKnight.class));