diff --git a/Mage.Sets/src/mage/cards/c/CavernWhisperer.java b/Mage.Sets/src/mage/cards/c/CavernWhisperer.java
new file mode 100644
index 0000000000..ee090377e3
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/c/CavernWhisperer.java
@@ -0,0 +1,46 @@
+package mage.cards.c;
+
+import mage.MageInt;
+import mage.abilities.common.MutatesSourceTriggeredAbility;
+import mage.abilities.effects.common.discard.DiscardEachPlayerEffect;
+import mage.abilities.keyword.MenaceAbility;
+import mage.abilities.keyword.MutateAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.SubType;
+import mage.constants.TargetController;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class CavernWhisperer extends CardImpl {
+
+    public CavernWhisperer(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{4}{B}");
+
+        this.subtype.add(SubType.NIGHTMARE);
+        this.power = new MageInt(4);
+        this.toughness = new MageInt(4);
+
+        // Mutate {3}{B}
+        this.addAbility(new MutateAbility(this, "{3}{B}"));
+
+        // Menace
+        this.addAbility(new MenaceAbility());
+
+        // Whenever this creature mutates, each opponent discards a card.
+        this.addAbility(new MutatesSourceTriggeredAbility(new DiscardEachPlayerEffect(TargetController.OPPONENT)));
+    }
+
+    private CavernWhisperer(final CavernWhisperer card) {
+        super(card);
+    }
+
+    @Override
+    public CavernWhisperer copy() {
+        return new CavernWhisperer(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/IkoriaLairOfBehemoths.java b/Mage.Sets/src/mage/sets/IkoriaLairOfBehemoths.java
index a0d8ec602c..ed2f2cdc5a 100644
--- a/Mage.Sets/src/mage/sets/IkoriaLairOfBehemoths.java
+++ b/Mage.Sets/src/mage/sets/IkoriaLairOfBehemoths.java
@@ -28,6 +28,7 @@ public final class IkoriaLairOfBehemoths extends ExpansionSet {
 
         cards.add(new SetCardInfo("Boon of the Wish-Giver", 43, Rarity.UNCOMMON, mage.cards.b.BoonOfTheWishGiver.class));
         cards.add(new SetCardInfo("Bristling Boar", 146, Rarity.COMMON, mage.cards.b.BristlingBoar.class));
+        cards.add(new SetCardInfo("Cavern Whisperer", 79, Rarity.COMMON, mage.cards.c.CavernWhisperer.class));
         cards.add(new SetCardInfo("Chittering Harvester", 80, Rarity.UNCOMMON, mage.cards.c.ChitteringHarvester.class));
         cards.add(new SetCardInfo("Cloudpiercer", 112, Rarity.COMMON, mage.cards.c.Cloudpiercer.class));
         cards.add(new SetCardInfo("Colossification", 148, Rarity.RARE, mage.cards.c.Colossification.class));