Fix looking at face-down creatures; implement [MKM] Lumbering Laundry (#12479)

Mage/src/main/java/mage/abilities/effects/common/continuous/LookAtOpponentFaceDownCreaturesAnyTimeEffect.java

@@ -0,0 +1,59 @@
+package mage.abilities.effects.common.continuous;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.ContinuousEffectImpl;
+import mage.cards.Cards;
+import mage.cards.CardsImpl;
+import mage.constants.*;
+import mage.filter.common.FilterCreaturePermanent;
+import mage.filter.predicate.card.FaceDownPredicate;
+import mage.game.Game;
+import mage.players.Player;
+
+/**
+ * @author notgreat
+ */
+public class LookAtOpponentFaceDownCreaturesAnyTimeEffect extends ContinuousEffectImpl {
+    private static final FilterCreaturePermanent filter = new FilterCreaturePermanent("face-down creatures you don't control");
+
+    static {
+        filter.add(FaceDownPredicate.instance);
+        filter.add(TargetController.NOT_YOU.getControllerPredicate());
+    }
+
+    public LookAtOpponentFaceDownCreaturesAnyTimeEffect() {
+        this(Duration.WhileOnBattlefield);
+    }
+
+    public LookAtOpponentFaceDownCreaturesAnyTimeEffect(Duration duration) {
+        super(duration, Layer.PlayerEffects, SubLayer.NA, Outcome.Benefit);
+        staticText = (duration.toString().isEmpty() ? "" : duration.toString() + ", ") + "you may look at face-down creatures you don't control any time";
+    }
+
+    protected LookAtOpponentFaceDownCreaturesAnyTimeEffect(final LookAtOpponentFaceDownCreaturesAnyTimeEffect effect) {
+        super(effect);
+    }
+
+    //Based on LookAtTopCardOfLibraryAnyTimeEffect
+    @Override
+    public boolean apply(Game game, Ability source) {
+        if (game.inCheckPlayableState()) { // Ignored - see https://github.com/magefree/mage/issues/6994
+            return false;
+        }
+        Player controller = game.getPlayer(source.getControllerId());
+        if (controller == null) {
+            return false;
+        }
+        Cards cards = new CardsImpl(game.getBattlefield().getActivePermanents(filter, source.getControllerId(), source, game));
+        if (cards.isEmpty()) {
+            return false;
+        }
+        controller.lookAtCards(source, "Face Down Creatures", cards, game);
+        return true;
+    }
+
+    @Override
+    public LookAtOpponentFaceDownCreaturesAnyTimeEffect copy() {
+        return new LookAtOpponentFaceDownCreaturesAnyTimeEffect(this);
+    }
+}