diff --git a/Mage.Sets/src/mage/cards/d/Defile.java b/Mage.Sets/src/mage/cards/d/Defile.java
new file mode 100644
index 00000000000..3bda95ddfd5
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/d/Defile.java
@@ -0,0 +1,49 @@
+package mage.cards.d;
+
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.dynamicvalue.common.PermanentsOnBattlefieldCount;
+import mage.abilities.effects.common.continuous.BoostTargetEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.SubType;
+import mage.filter.FilterPermanent;
+import mage.filter.common.FilterControlledPermanent;
+import mage.filter.predicate.mageobject.SubtypePredicate;
+import mage.target.common.TargetCreaturePermanent;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class Defile extends CardImpl {
+
+    private static final FilterPermanent filter = new FilterControlledPermanent();
+
+    static {
+        filter.add(new SubtypePredicate(SubType.SWAMP));
+    }
+
+    private static final DynamicValue xValue = new PermanentsOnBattlefieldCount(filter, -1);
+
+    public Defile(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{B}");
+
+        // Target creature gets -1/-1 until end of turn for each Swamp you control.
+        this.getSpellAbility().addEffect(new BoostTargetEffect(
+                xValue, xValue, Duration.EndOfTurn, true
+        ).setText("Target creature gets -1/-1 until end of turn for each Swamp you control."));
+        this.getSpellAbility().addTarget(new TargetCreaturePermanent());
+    }
+
+    private Defile(final Defile card) {
+        super(card);
+    }
+
+    @Override
+    public Defile copy() {
+        return new Defile(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/ModernHorizons.java b/Mage.Sets/src/mage/sets/ModernHorizons.java
index eddc2bd8558..b193748a95c 100644
--- a/Mage.Sets/src/mage/sets/ModernHorizons.java
+++ b/Mage.Sets/src/mage/sets/ModernHorizons.java
@@ -51,6 +51,7 @@ public final class ModernHorizons extends ExpansionSet {
         cards.add(new SetCardInfo("Crypt Rats", 84, Rarity.UNCOMMON, mage.cards.c.CryptRats.class));
         cards.add(new SetCardInfo("Dead of Winter", 85, Rarity.RARE, mage.cards.d.DeadOfWinter.class));
         cards.add(new SetCardInfo("Deep Forest Hermit", 161, Rarity.RARE, mage.cards.d.DeepForestHermit.class));
+        cards.add(new SetCardInfo("Defile", 86, Rarity.COMMON, mage.cards.d.Defile.class));
         cards.add(new SetCardInfo("Diabolic Edict", 87, Rarity.COMMON, mage.cards.d.DiabolicEdict.class));
         cards.add(new SetCardInfo("Dismantling Blow", 5, Rarity.UNCOMMON, mage.cards.d.DismantlingBlow.class));
         cards.add(new SetCardInfo("Dregscape Sliver", 88, Rarity.UNCOMMON, mage.cards.d.DregscapeSliver.class));