[WOE] Implement Decadent Dragon (#10852)

Grouped together a few Gonti-like look effect.

Co-authored-by: Evan Kranzler <theelk801@gmail.com>

Mage/src/main/java/mage/abilities/effects/common/asthought/MayLookAtTargetCardEffect.java

@@ -0,0 +1,51 @@
+package mage.abilities.effects.common.asthought;
+
+
+import mage.abilities.Ability;
+import mage.abilities.effects.AsThoughEffectImpl;
+import mage.constants.AsThoughEffectType;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.game.Game;
+
+import java.util.UUID;
+
+/**
+ * @author Susucr
+ * <p>
+ * An authorized player may look at the target card for as long it remains exiled.
+ */
+public class MayLookAtTargetCardEffect extends AsThoughEffectImpl {
+    private final UUID authorizedPlayerId;
+
+    public MayLookAtTargetCardEffect(UUID authorizedPlayerId) {
+        super(AsThoughEffectType.LOOK_AT_FACE_DOWN, Duration.EndOfGame, Outcome.Benefit);
+        this.authorizedPlayerId = authorizedPlayerId;
+        staticText = "You may look at the cards exiled with {this}";
+    }
+
+    private MayLookAtTargetCardEffect(final MayLookAtTargetCardEffect effect) {
+        super(effect);
+        this.authorizedPlayerId = effect.authorizedPlayerId;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return true;
+    }
+
+    @Override
+    public MayLookAtTargetCardEffect copy() {
+        return new MayLookAtTargetCardEffect(this);
+    }
+
+    @Override
+    public boolean applies(UUID objectId, Ability source, UUID affectedControllerId, Game game) {
+        UUID cardId = getTargetPointer().getFirst(game, source);
+        if (cardId == null) {
+            this.discard(); // card is no longer in the origin zone, effect can be discarded
+        }
+        return affectedControllerId.equals(authorizedPlayerId)
+                && objectId.equals(cardId);
+    }
+}