diff --git a/Mage.Sets/src/mage/cards/s/ShriekwoodDevourer.java b/Mage.Sets/src/mage/cards/s/ShriekwoodDevourer.java
new file mode 100644
index 00000000000..c526bc9696f
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/s/ShriekwoodDevourer.java
@@ -0,0 +1,84 @@
+package mage.cards.s;
+
+import mage.MageInt;
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.common.AttacksWithCreaturesTriggeredAbility;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.UntapLandsEffect;
+import mage.abilities.keyword.TrampleAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.constants.Zone;
+import mage.filter.StaticFilters;
+import mage.game.Game;
+
+import java.util.Objects;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class ShriekwoodDevourer extends CardImpl {
+
+    public ShriekwoodDevourer(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{5}{G}{G}");
+
+        this.subtype.add(SubType.TREEFOLK);
+        this.power = new MageInt(7);
+        this.toughness = new MageInt(5);
+
+        // Trample
+        this.addAbility(TrampleAbility.getInstance());
+
+        // Whenever you attack with one or more creatures, untap up to X lands, where X is the greatest power among those creatures.
+        this.addAbility(new AttacksWithCreaturesTriggeredAbility(
+                Zone.BATTLEFIELD, new ShriekwoodDevourerEffect(),
+                1, StaticFilters.FILTER_PERMANENT_CREATURES
+        ).setTriggerPhrase("Whenever you attack with one or more creatures, "));
+    }
+
+    private ShriekwoodDevourer(final ShriekwoodDevourer card) {
+        super(card);
+    }
+
+    @Override
+    public ShriekwoodDevourer copy() {
+        return new ShriekwoodDevourer(this);
+    }
+}
+
+class ShriekwoodDevourerEffect extends OneShotEffect {
+
+    ShriekwoodDevourerEffect() {
+        super(Outcome.Benefit);
+        staticText = "untap up to X lands, where X is the greatest power among those creatures";
+    }
+
+    private ShriekwoodDevourerEffect(final ShriekwoodDevourerEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public ShriekwoodDevourerEffect copy() {
+        return new ShriekwoodDevourerEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        int xValue = this
+                .getTargetPointer()
+                .getTargets(game, source)
+                .stream()
+                .map(game::getPermanent)
+                .filter(Objects::nonNull)
+                .map(MageObject::getPower)
+                .mapToInt(MageInt::getValue)
+                .max()
+                .orElse(0);
+        return xValue > 0 && new UntapLandsEffect(xValue).apply(game, source);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/DuskmournHouseOfHorrorCommander.java b/Mage.Sets/src/mage/sets/DuskmournHouseOfHorrorCommander.java
index 7656b2d21bd..0e6f3043460 100644
--- a/Mage.Sets/src/mage/sets/DuskmournHouseOfHorrorCommander.java
+++ b/Mage.Sets/src/mage/sets/DuskmournHouseOfHorrorCommander.java
@@ -222,6 +222,7 @@ public final class DuskmournHouseOfHorrorCommander extends ExpansionSet {
         cards.add(new SetCardInfo("Shark Typhoon", 127, Rarity.RARE, mage.cards.s.SharkTyphoon.class));
         cards.add(new SetCardInfo("Shigeki, Jukai Visionary", 198, Rarity.RARE, mage.cards.s.ShigekiJukaiVisionary.class));
         cards.add(new SetCardInfo("Shivan Gorge", 297, Rarity.RARE, mage.cards.s.ShivanGorge.class));
+        cards.add(new SetCardInfo("Shriekwood Devourer", 35, Rarity.RARE, mage.cards.s.ShriekwoodDevourer.class));
         cards.add(new SetCardInfo("Sigil of the Empty Throne", 103, Rarity.RARE, mage.cards.s.SigilOfTheEmptyThrone.class));
         cards.add(new SetCardInfo("Sign in Blood", 156, Rarity.COMMON, mage.cards.s.SignInBlood.class));
         cards.add(new SetCardInfo("Simic Growth Chamber", 298, Rarity.UNCOMMON, mage.cards.s.SimicGrowthChamber.class));