diff --git a/Mage.Sets/src/mage/cards/m/MassacreWurm.java b/Mage.Sets/src/mage/cards/m/MassacreWurm.java
index 86499f56004..48d3342c7a1 100644
--- a/Mage.Sets/src/mage/cards/m/MassacreWurm.java
+++ b/Mage.Sets/src/mage/cards/m/MassacreWurm.java
@@ -1,5 +1,3 @@
-
-
 package mage.cards.m;
 
 import java.util.UUID;
@@ -28,8 +26,8 @@ import mage.target.targetpointer.FixedTarget;
  */
 public final class MassacreWurm extends CardImpl {
 
-    public MassacreWurm (UUID ownerId, CardSetInfo setInfo) {
-        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{3}{B}{B}{B}");
+    public MassacreWurm(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{3}{B}{B}{B}");
         this.subtype.add(SubType.WURM);
 
         this.power = new MageInt(6);
@@ -38,7 +36,7 @@ public final class MassacreWurm extends CardImpl {
         this.addAbility(new MassacreWurmTriggeredAbility());
     }
 
-    public MassacreWurm (final MassacreWurm card) {
+    public MassacreWurm(final MassacreWurm card) {
         super(card);
     }
 
@@ -50,6 +48,7 @@ public final class MassacreWurm extends CardImpl {
 }
 
 class MassacreWurmTriggeredAbility extends TriggeredAbilityImpl {
+
     MassacreWurmTriggeredAbility() {
         super(Zone.BATTLEFIELD, new LoseLifeTargetEffect(2));
     }
@@ -70,7 +69,7 @@ class MassacreWurmTriggeredAbility extends TriggeredAbilityImpl {
 
     @Override
     public boolean checkTrigger(GameEvent event, Game game) {
-        if (((ZoneChangeEvent)event).isDiesEvent()) {
+        if (((ZoneChangeEvent) event).isDiesEvent()) {
             Permanent p = (Permanent) game.getLastKnownInformation(event.getTargetId(), Zone.BATTLEFIELD);
             if (p != null && p.isCreature() && game.getOpponents(this.getControllerId()).contains(p.getControllerId())) {
                 for (Effect effect : this.getEffects()) {
@@ -84,6 +83,6 @@ class MassacreWurmTriggeredAbility extends TriggeredAbilityImpl {
 
     @Override
     public String getRule() {
-        return "Whenever a creature an opponent controls is put into a graveyard from the battlefield, " + super.getRule();
+        return "Whenever a creature an opponent controls dies, " + super.getRule();
     }
-}
\ No newline at end of file
+}
diff --git a/Mage.Sets/src/mage/cards/p/PlagueMare.java b/Mage.Sets/src/mage/cards/p/PlagueMare.java
new file mode 100644
index 00000000000..277b9d4113a
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/p/PlagueMare.java
@@ -0,0 +1,61 @@
+package mage.cards.p;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.ObjectColor;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.common.combat.CantBeBlockedByCreaturesSourceEffect;
+import mage.abilities.effects.common.continuous.BoostOpponentsEffect;
+import mage.constants.SubType;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.Zone;
+import mage.filter.common.FilterCreaturePermanent;
+import mage.filter.predicate.mageobject.ColorPredicate;
+
+/**
+ *
+ * @author TheElk801
+ */
+public final class PlagueMare extends CardImpl {
+
+    private static final FilterCreaturePermanent filter = new FilterCreaturePermanent("white creatures");
+
+    static {
+        filter.add(new ColorPredicate(ObjectColor.WHITE));
+    }
+
+    public PlagueMare(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{B}{B}");
+
+        this.subtype.add(SubType.NIGHTMARE);
+        this.subtype.add(SubType.HORSE);
+        this.power = new MageInt(2);
+        this.toughness = new MageInt(2);
+
+        // Plague Mare can't be blocked by white creatures.
+        this.addAbility(new SimpleStaticAbility(
+                Zone.BATTLEFIELD,
+                new CantBeBlockedByCreaturesSourceEffect(
+                        filter, Duration.WhileOnBattlefield
+                )
+        ));
+
+        // When Plague Mare enters the battlefield, creatures your opponents control get -1/-1 until end of turn.
+        this.addAbility(new EntersBattlefieldTriggeredAbility(
+                new BoostOpponentsEffect(-1, -1, Duration.EndOfTurn)
+        ));
+    }
+
+    public PlagueMare(final PlagueMare card) {
+        super(card);
+    }
+
+    @Override
+    public PlagueMare copy() {
+        return new PlagueMare(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/CoreSet2019.java b/Mage.Sets/src/mage/sets/CoreSet2019.java
index e4804f205a9..be39ebd88f1 100644
--- a/Mage.Sets/src/mage/sets/CoreSet2019.java
+++ b/Mage.Sets/src/mage/sets/CoreSet2019.java
@@ -139,6 +139,7 @@ public final class CoreSet2019 extends ExpansionSet {
         cards.add(new SetCardInfo("Palladia-Mors, the Ruiner", 219, Rarity.MYTHIC, mage.cards.p.PalladiaMorsTheRuiner.class));
         cards.add(new SetCardInfo("Patient Rebuilding", 67, Rarity.RARE, mage.cards.p.PatientRebuilding.class));
         cards.add(new SetCardInfo("Pegasus Courser", 32, Rarity.COMMON, mage.cards.p.PegasusCourser.class));
+        cards.add(new SetCardInfo("Plague Mare", 114, Rarity.UNCOMMON, mage.cards.p.PlagueMare.class));
         cards.add(new SetCardInfo("Plummet", 193, Rarity.COMMON, mage.cards.p.Plummet.class));
         cards.add(new SetCardInfo("Prodigious Growth", 194, Rarity.RARE, mage.cards.p.ProdigiousGrowth.class));
         cards.add(new SetCardInfo("Psychic Symbiont", 221, Rarity.UNCOMMON, mage.cards.p.PsychicSymbiont.class));