diff --git a/Mage.Sets/src/mage/cards/m/MolderingGymWeightRoom.java b/Mage.Sets/src/mage/cards/m/MolderingGymWeightRoom.java
new file mode 100644
index 00000000000..0460d7f8d01
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/m/MolderingGymWeightRoom.java
@@ -0,0 +1,44 @@
+package mage.cards.m;
+
+import mage.abilities.common.UnlockThisDoorTriggeredAbility;
+import mage.abilities.effects.common.search.SearchLibraryPutInPlayEffect;
+import mage.abilities.effects.keyword.ManifestDreadEffect;
+import mage.cards.CardSetInfo;
+import mage.cards.RoomCard;
+import mage.counters.CounterType;
+import mage.filter.StaticFilters;
+import mage.target.common.TargetCardInLibrary;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class MolderingGymWeightRoom extends RoomCard {
+    public MolderingGymWeightRoom(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, "{2}{G}", "{5}{G}");
+
+        // Moldering Gym
+        // When you unlock this door, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
+        this.getLeftHalfCard().addAbility(new UnlockThisDoorTriggeredAbility(
+                new SearchLibraryPutInPlayEffect(
+                        new TargetCardInLibrary(StaticFilters.FILTER_CARD_BASIC_LAND), true
+                ), false, true
+        ));
+
+        // Weight Room
+        // When you unlock this door, manifest dread, then put three +1/+1 counters on that creature.
+        this.getRightHalfCard().addAbility(new UnlockThisDoorTriggeredAbility(
+                new ManifestDreadEffect(CounterType.P1P1.createInstance(3)), false, false
+        ));
+    }
+
+    private MolderingGymWeightRoom(final MolderingGymWeightRoom card) {
+        super(card);
+    }
+
+    @Override
+    public MolderingGymWeightRoom copy() {
+        return new MolderingGymWeightRoom(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/cards/u/UnderwaterTunnelSlimyAquarium.java b/Mage.Sets/src/mage/cards/u/UnderwaterTunnelSlimyAquarium.java
index 2d7a2223b28..35a06ae9f41 100644
--- a/Mage.Sets/src/mage/cards/u/UnderwaterTunnelSlimyAquarium.java
+++ b/Mage.Sets/src/mage/cards/u/UnderwaterTunnelSlimyAquarium.java
@@ -1,17 +1,11 @@
 package mage.cards.u;
 
-import mage.abilities.Ability;
 import mage.abilities.common.UnlockThisDoorTriggeredAbility;
-import mage.abilities.effects.OneShotEffect;
 import mage.abilities.effects.keyword.ManifestDreadEffect;
 import mage.abilities.effects.keyword.SurveilEffect;
 import mage.cards.CardSetInfo;
 import mage.cards.RoomCard;
-import mage.constants.Outcome;
 import mage.counters.CounterType;
-import mage.game.Game;
-import mage.game.permanent.Permanent;
-import mage.players.Player;
 
 import java.util.UUID;
 
@@ -28,7 +22,7 @@ public final class UnderwaterTunnelSlimyAquarium extends RoomCard {
 
         // Slimy Aquarium
         // When you unlock this door, manifest dread, then put a +1/+1 counter on that creature.
-        this.getRightHalfCard().addAbility(new UnlockThisDoorTriggeredAbility(new SlimyAquariumEffect(), false, false));
+        this.getRightHalfCard().addAbility(new UnlockThisDoorTriggeredAbility(new ManifestDreadEffect(CounterType.P1P1.createInstance()), false, false));
     }
 
     private UnderwaterTunnelSlimyAquarium(final UnderwaterTunnelSlimyAquarium card) {
@@ -40,30 +34,3 @@ public final class UnderwaterTunnelSlimyAquarium extends RoomCard {
         return new UnderwaterTunnelSlimyAquarium(this);
     }
 }
-
-class SlimyAquariumEffect extends OneShotEffect {
-
-    SlimyAquariumEffect() {
-        super(Outcome.Benefit);
-        staticText = "manifest dread, then put a +1/+1 counter on that creature";
-    }
-
-    private SlimyAquariumEffect(final SlimyAquariumEffect effect) {
-        super(effect);
-    }
-
-    @Override
-    public SlimyAquariumEffect copy() {
-        return new SlimyAquariumEffect(this);
-    }
-
-    @Override
-    public boolean apply(Game game, Ability source) {
-        Player player = game.getPlayer(source.getControllerId());
-        if (player == null) {
-            return false;
-        }
-        Permanent permanent = ManifestDreadEffect.doManifestDread(player, source, game);
-        return permanent != null && permanent.addCounters(CounterType.P1P1.createInstance(), source, game);
-    }
-}
diff --git a/Mage.Sets/src/mage/sets/DuskmournHouseOfHorror.java b/Mage.Sets/src/mage/sets/DuskmournHouseOfHorror.java
index 32f98eca9aa..56e70d16488 100644
--- a/Mage.Sets/src/mage/sets/DuskmournHouseOfHorror.java
+++ b/Mage.Sets/src/mage/sets/DuskmournHouseOfHorror.java
@@ -228,6 +228,7 @@ public final class DuskmournHouseOfHorror extends ExpansionSet {
         cards.add(new SetCardInfo("Meathook Massacre II", 311, Rarity.MYTHIC, mage.cards.m.MeathookMassacreII.class, NON_FULL_USE_VARIOUS));
         cards.add(new SetCardInfo("Miasma Demon", 109, Rarity.UNCOMMON, mage.cards.m.MiasmaDemon.class));
         cards.add(new SetCardInfo("Midnight Mayhem", 222, Rarity.UNCOMMON, mage.cards.m.MidnightMayhem.class));
+        cards.add(new SetCardInfo("Moldering Gym // Weight Room", 190, Rarity.COMMON, mage.cards.m.MolderingGymWeightRoom.class));
         cards.add(new SetCardInfo("Monstrous Emergence", 191, Rarity.COMMON, mage.cards.m.MonstrousEmergence.class));
         cards.add(new SetCardInfo("Most Valuable Slayer", 144, Rarity.COMMON, mage.cards.m.MostValuableSlayer.class));
         cards.add(new SetCardInfo("Mountain", 275, Rarity.LAND, mage.cards.basiclands.Mountain.class, FULL_ART_BFZ_VARIOUS));
diff --git a/Mage/src/main/java/mage/abilities/effects/keyword/ManifestDreadEffect.java b/Mage/src/main/java/mage/abilities/effects/keyword/ManifestDreadEffect.java
index 08b39d74c6d..aad005ef354 100644
--- a/Mage/src/main/java/mage/abilities/effects/keyword/ManifestDreadEffect.java
+++ b/Mage/src/main/java/mage/abilities/effects/keyword/ManifestDreadEffect.java
@@ -7,6 +7,7 @@ import mage.cards.Cards;
 import mage.cards.CardsImpl;
 import mage.constants.Outcome;
 import mage.constants.Zone;
+import mage.counters.Counter;
 import mage.game.Game;
 import mage.game.events.ManifestedDreadEvent;
 import mage.game.permanent.Permanent;
@@ -14,18 +15,28 @@ import mage.players.Player;
 import mage.target.TargetCard;
 import mage.target.common.TargetCardInLibrary;
 
+import java.util.Optional;
+
 /**
  * @author TheElk801
  */
 public class ManifestDreadEffect extends OneShotEffect {
 
+    private final Counter counter;
+
     public ManifestDreadEffect() {
+        this((Counter) null);
+    }
+
+    public ManifestDreadEffect(Counter counter) {
         super(Outcome.Benefit);
-        staticText = "manifest dread";
+        this.counter = counter;
+        staticText = "manifest dread" + (counter != null ? ", then put " + counter.getDescription() + " on that creature" : "");
     }
 
     private ManifestDreadEffect(final ManifestDreadEffect effect) {
         super(effect);
+        this.counter = Optional.ofNullable(effect.counter).map(Counter::copy).orElse(null);
     }
 
     @Override
@@ -36,7 +47,17 @@ public class ManifestDreadEffect extends OneShotEffect {
     @Override
     public boolean apply(Game game, Ability source) {
         Player player = game.getPlayer(source.getControllerId());
-        return player != null && doManifestDread(player, source, game) != null;
+        if (player == null) {
+            return false;
+        }
+        Permanent permanent = doManifestDread(player, source, game);
+        if (permanent == null) {
+            return false;
+        }
+        if (counter != null) {
+            permanent.addCounters(counter, source, game);
+        }
+        return true;
     }
 
     public static Permanent doManifestDread(Player player, Ability source, Game game) {