[EOE] Implement Temporal Intervention

Mage/src/main/java/mage/abilities/condition/common/VoidCondition.java

@@ -0,0 +1,32 @@
+package mage.abilities.condition.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.abilities.hint.ConditionHint;
+import mage.abilities.hint.Hint;
+import mage.game.Game;
+import mage.watchers.common.VoidWatcher;
+
+/**
+ * Requires {@link mage.watchers.common.VoidWatcher}
+ *
+ * @author TheElk801
+ */
+public enum VoidCondition implements Condition {
+    instance;
+    private static final Hint hint = new ConditionHint(instance);
+
+    public static Hint getHint() {
+        return hint;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return VoidWatcher.checkPlayer(source.getControllerId(), game);
+    }
+
+    @Override
+    public String toString() {
+        return "a nonland permanent left the battlefield this turn or a spell was warped this turn";
+    }
+}

Mage/src/main/java/mage/constants/AbilityWord.java

@@ -63,6 +63,7 @@ public enum AbilityWord {
     THRESHOLD("Threshold"),
     UNDERGROWTH("Undergrowth"),
     VALIANT("Valiant"),
+    VOID("Void"),
     WILL_OF_THE_COUNCIL("Will of the council"),
     WILL_OF_THE_PLANESWALKERS("Will of the planeswalkers");
 

Mage/src/main/java/mage/watchers/common/VoidWatcher.java

@@ -0,0 +1,56 @@
+package mage.watchers.common;
+
+import mage.constants.WatcherScope;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.events.ZoneChangeEvent;
+import mage.watchers.Watcher;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * TODO: this doesn't handle warp yet
+ *
+ * @author TheElk801
+ */
+public class VoidWatcher extends Watcher {
+
+    // need to track separately for each player as it needs to be in range
+    private final Set<UUID> players = new HashSet<>();
+
+    public VoidWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        switch (event.getType()) {
+            case SPELL_CAST:
+                return;
+            case ZONE_CHANGE:
+                ZoneChangeEvent zEvent = (ZoneChangeEvent) event;
+                if (Zone.BATTLEFIELD.match(zEvent.getFromZone())
+                        && zEvent.getTarget() != null
+                        && !zEvent.getTarget().isLand(game)) {
+                    players.addAll(game.getState().getPlayersInRange(zEvent.getTarget().getControllerId(), game));
+                }
+        }
+    }
+
+    @Override
+    public void reset() {
+        super.reset();
+        players.clear();
+    }
+
+    public static boolean checkPlayer(UUID playerId, Game game) {
+        return game
+                .getState()
+                .getWatcher(VoidWatcher.class)
+                .players
+                .contains(playerId);
+    }
+}