implement [MH3] Six

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

@@ -0,0 +1,67 @@
+package mage.abilities.effects.common.continuous;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.ContinuousEffectImpl;
+import mage.abilities.keyword.RetraceAbility;
+import mage.cards.*;
+import mage.constants.Duration;
+import mage.constants.Layer;
+import mage.constants.Outcome;
+import mage.constants.SubLayer;
+import mage.filter.FilterCard;
+import mage.game.Game;
+import mage.players.Player;
+import mage.util.CardUtil;
+
+import java.util.UUID;
+
+/**
+ * "[filter] cards in your graveyard have retrace."
+ *
+ * @author Susucr
+ */
+public class GainRetraceYourGraveyardEffect extends ContinuousEffectImpl {
+
+    private final FilterCard filter;
+
+    public GainRetraceYourGraveyardEffect(FilterCard filter) {
+        this(Duration.WhileOnBattlefield, filter);
+    }
+
+    public GainRetraceYourGraveyardEffect(Duration duration, FilterCard filter) {
+        super(duration, Layer.AbilityAddingRemovingEffects_6, SubLayer.NA, Outcome.AddAbility);
+        this.filter = filter;
+        staticText = filter.getMessage() + " in your graveyard have retrace.";
+    }
+
+    private GainRetraceYourGraveyardEffect(final GainRetraceYourGraveyardEffect effect) {
+        super(effect);
+        this.filter = effect.filter;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player controller = game.getPlayer(source.getControllerId());
+        if (controller == null) {
+            return false;
+        }
+        for (UUID cardId : controller.getGraveyard()) {
+            Card card = game.getCard(cardId);
+            if (card == null) {
+                continue;
+            }
+            for (Card faceCard : CardUtil.getCastableComponents(card, filter, source, controller, game, null, false)) {
+                Ability ability = new RetraceAbility(faceCard);
+                ability.setSourceId(cardId);
+                ability.setControllerId(faceCard.getOwnerId());
+                game.getState().addOtherAbility(faceCard, ability);
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public GainRetraceYourGraveyardEffect copy() {
+        return new GainRetraceYourGraveyardEffect(this);
+    }
+}