[MKM] Implement Goblin Maskmaker (#11884)

* [MKM] Implement Goblin Maskmaker

Mage.Sets/src/mage/cards/g/GoblinMaskmaker.java

@@ -0,0 +1,74 @@
+package mage.cards.g;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.SpellAbility;
+import mage.abilities.common.AttacksTriggeredAbility;
+import mage.abilities.effects.common.cost.SpellsCostReductionControllerEffect;
+import mage.constants.Duration;
+import mage.constants.SubType;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.filter.FilterCard;
+import mage.game.Game;
+
+/**
+ *
+ * @author DominionSpy
+ */
+public final class GoblinMaskmaker extends CardImpl {
+
+    public GoblinMaskmaker(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{R}");
+
+        this.subtype.add(SubType.GOBLIN);
+        this.subtype.add(SubType.CITIZEN);
+        this.power = new MageInt(1);
+        this.toughness = new MageInt(2);
+
+        // Whenever Goblin Maskmaker attacks, face-down spells you cast this turn cost {1} less to cast.
+        this.addAbility(new AttacksTriggeredAbility(new GoblinMaskmakerEffect()));
+    }
+
+    private GoblinMaskmaker(final GoblinMaskmaker card) {
+        super(card);
+    }
+
+    @Override
+    public GoblinMaskmaker copy() {
+        return new GoblinMaskmaker(this);
+    }
+}
+
+class GoblinMaskmakerEffect extends SpellsCostReductionControllerEffect {
+
+    private static final FilterCard filter = new FilterCard("face-down spells");
+
+    GoblinMaskmakerEffect() {
+        super(filter, 1);
+        this.duration = Duration.EndOfTurn;
+        this.staticText = "face-down spells you cast this turn cost {1} less to cast";
+    }
+
+    private GoblinMaskmakerEffect(final GoblinMaskmakerEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public GoblinMaskmakerEffect copy() {
+        return new GoblinMaskmakerEffect(this);
+    }
+
+    @Override
+    public boolean applies(Ability abilityToModify, Ability source, Game game) {
+        if (abilityToModify instanceof SpellAbility) {
+            SpellAbility spellAbility = (SpellAbility) abilityToModify;
+            if (spellAbility.getSpellAbilityCastMode().isFaceDown()) {
+                return super.applies(abilityToModify, source, game);
+            }
+        }
+        return false;
+    }
+}

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

@@ -123,6 +123,7 @@ public final class MurdersAtKarlovManor extends ExpansionSet {
         cards.add(new SetCardInfo("Get a Leg Up", 161, Rarity.UNCOMMON, mage.cards.g.GetALegUp.class));
         cards.add(new SetCardInfo("Gleaming Geardrake", 205, Rarity.UNCOMMON, mage.cards.g.GleamingGeardrake.class));
         cards.add(new SetCardInfo("Glint Weaver", 162, Rarity.UNCOMMON, mage.cards.g.GlintWeaver.class));
+        cards.add(new SetCardInfo("Goblin Maskmaker", 130, Rarity.COMMON, mage.cards.g.GoblinMaskmaker.class));
         cards.add(new SetCardInfo("Granite Witness", 206, Rarity.COMMON, mage.cards.g.GraniteWitness.class));
         cards.add(new SetCardInfo("Gravestone Strider", 252, Rarity.COMMON, mage.cards.g.GravestoneStrider.class));
         cards.add(new SetCardInfo("Greenbelt Radical", 163, Rarity.UNCOMMON, mage.cards.g.GreenbeltRadical.class));