diff --git a/Mage.Sets/src/mage/cards/t/TheMasterOfKeys.java b/Mage.Sets/src/mage/cards/t/TheMasterOfKeys.java
new file mode 100644
index 00000000000..78aaae7b8b3
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/t/TheMasterOfKeys.java
@@ -0,0 +1,105 @@
+package mage.cards.t;
+
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.common.MillCardsControllerEffect;
+import mage.abilities.effects.common.counter.AddCountersSourceEffect;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.dynamicvalue.MultipliedValue;
+import mage.abilities.dynamicvalue.common.GetXValue;
+import mage.abilities.keyword.FlyingAbility;
+import mage.abilities.effects.ContinuousEffectImpl;
+import mage.abilities.keyword.EscapeAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.SubType;
+import mage.constants.SuperType;
+import mage.counters.CounterType;
+import mage.constants.*;
+import mage.game.Game;
+import mage.players.Player;
+
+import java.util.Objects;
+import java.util.UUID;
+
+/**
+ *
+ * @author Callumvl
+ */
+public final class TheMasterOfKeys extends CardImpl {
+
+    private static final DynamicValue xValue = new MultipliedValue(GetXValue.instance, 2);
+
+    public TheMasterOfKeys(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT, CardType.CREATURE}, "{X}{W}{U}{B}");
+        
+        this.supertype.add(SuperType.LEGENDARY);
+        this.subtype.add(SubType.HORROR);
+        this.power = new MageInt(3);
+        this.toughness = new MageInt(3);
+
+        // Flying
+        this.addAbility(FlyingAbility.getInstance());
+
+        // When The Master of Keys enters, put X +1/+1 counters on it and mill twice X cards.
+        Ability ability = new EntersBattlefieldTriggeredAbility(new AddCountersSourceEffect(CounterType.P1P1.createInstance(), GetXValue.instance).setText("put X +1/+1 counters on it"));
+        ability.addEffect(new MillCardsControllerEffect(xValue).setText("and mill twice X cards."));
+        this.addAbility(ability);
+
+        // Each enchantment card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard.
+        this.addAbility(new SimpleStaticAbility(new TheMasterOfKeysEffect()));
+    }
+
+    private TheMasterOfKeys(final TheMasterOfKeys card) {
+        super(card);
+    }
+
+    @Override
+    public TheMasterOfKeys copy() {
+        return new TheMasterOfKeys(this);
+    }
+}
+
+class TheMasterOfKeysEffect extends ContinuousEffectImpl {
+
+    TheMasterOfKeysEffect() {
+        super(Duration.WhileOnBattlefield, Layer.AbilityAddingRemovingEffects_6, SubLayer.NA, Outcome.AddAbility);
+        staticText = "Each enchantment card in your graveyard has escape. " +
+                "The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard.";
+    }
+
+    private TheMasterOfKeysEffect(final TheMasterOfKeysEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player controller = game.getPlayer(source.getControllerId());
+        if (controller == null) {
+            return false;
+        }
+        controller
+                .getGraveyard()
+                .getCards(game)
+                .stream()
+                .filter(Objects::nonNull)
+                .filter(card -> !card.getManaCost().getText().isEmpty()) // card must have a mana cost
+                .filter(card -> card.isEnchantment(game)) // must be enchantment
+                .forEach(card -> {
+                    Ability ability = new EscapeAbility(card, card.getManaCost().getText(), 3);
+                    ability.setSourceId(card.getId());
+                    ability.setControllerId(card.getOwnerId());
+                    game.getState().addOtherAbility(card, ability);
+                });
+        return true;
+    }
+
+    @Override
+    public TheMasterOfKeysEffect copy() {
+        return new TheMasterOfKeysEffect(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/DuskmournHouseOfHorrorCommander.java b/Mage.Sets/src/mage/sets/DuskmournHouseOfHorrorCommander.java
index b8d5ef137f1..e03862fc9ad 100644
--- a/Mage.Sets/src/mage/sets/DuskmournHouseOfHorrorCommander.java
+++ b/Mage.Sets/src/mage/sets/DuskmournHouseOfHorrorCommander.java
@@ -266,6 +266,7 @@ public final class DuskmournHouseOfHorrorCommander extends ExpansionSet {
         cards.add(new SetCardInfo("Terminus", 70, Rarity.RARE, mage.cards.t.Terminus.class));
         cards.add(new SetCardInfo("The Eldest Reborn", 139, Rarity.UNCOMMON, mage.cards.t.TheEldestReborn.class));
         cards.add(new SetCardInfo("The Lord of Pain", 3, Rarity.MYTHIC, mage.cards.t.TheLordOfPain.class));
+        cards.add(new SetCardInfo("The Master of Keys", 4, Rarity.MYTHIC, mage.cards.t.TheMasterOfKeys.class));
         cards.add(new SetCardInfo("Theater of Horrors", 236, Rarity.RARE, mage.cards.t.TheaterOfHorrors.class));
         cards.add(new SetCardInfo("They Came from the Pipes", 14, Rarity.RARE, mage.cards.t.TheyCameFromThePipes.class));
         cards.add(new SetCardInfo("Thirst for Meaning", 129, Rarity.COMMON, mage.cards.t.ThirstForMeaning.class));