diff --git a/Mage.Sets/src/mage/cards/d/DiamondMare.java b/Mage.Sets/src/mage/cards/d/DiamondMare.java
new file mode 100644
index 00000000000..a239e90d4a3
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/d/DiamondMare.java
@@ -0,0 +1,86 @@
+package mage.cards.d;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.ObjectColor;
+import mage.abilities.TriggeredAbilityImpl;
+import mage.abilities.common.EntersBattlefieldAbility;
+import mage.abilities.effects.common.ChooseColorEffect;
+import mage.abilities.effects.common.GainLifeEffect;
+import mage.constants.SubType;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.Zone;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.stack.Spell;
+
+/**
+ *
+ * @author TheElk801
+ */
+public final class DiamondMare extends CardImpl {
+
+    public DiamondMare(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ARTIFACT, CardType.CREATURE}, "{2}");
+
+        this.subtype.add(SubType.HORSE);
+        this.power = new MageInt(1);
+        this.toughness = new MageInt(3);
+
+        // As Diamond Mare enters the battlefield, choose a color.
+        this.addAbility(new EntersBattlefieldAbility(new ChooseColorEffect(Outcome.Neutral)));
+
+        // Whenever you cast a spell of the chosen color, you gain 1 life.
+        this.addAbility(new DiamondMareTriggeredAbility());
+    }
+
+    public DiamondMare(final DiamondMare card) {
+        super(card);
+    }
+
+    @Override
+    public DiamondMare copy() {
+        return new DiamondMare(this);
+    }
+}
+
+class DiamondMareTriggeredAbility extends TriggeredAbilityImpl {
+
+    public DiamondMareTriggeredAbility() {
+        super(Zone.BATTLEFIELD, new GainLifeEffect(1), false);
+    }
+
+    public DiamondMareTriggeredAbility(final DiamondMareTriggeredAbility ability) {
+        super(ability);
+    }
+
+    @Override
+    public boolean checkEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.SPELL_CAST;
+    }
+
+    @Override
+    public boolean checkTrigger(GameEvent event, Game game) {
+        if (event.getPlayerId().equals(this.getControllerId())) {
+            Spell spell = game.getStack().getSpell(event.getTargetId());
+            ObjectColor color = (ObjectColor) game.getState().getValue(getSourceId() + "_color");
+            if (spell != null && color != null && spell.getColor(game).shares(color)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public String getRule() {
+        return "Whenever you cast a spell of the chosen color, you gain 1 life.";
+    }
+
+    @Override
+    public DiamondMareTriggeredAbility copy() {
+        return new DiamondMareTriggeredAbility(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/CoreSet2019.java b/Mage.Sets/src/mage/sets/CoreSet2019.java
index 45d37463a7e..fe6f729e96c 100644
--- a/Mage.Sets/src/mage/sets/CoreSet2019.java
+++ b/Mage.Sets/src/mage/sets/CoreSet2019.java
@@ -63,6 +63,7 @@ public final class CoreSet2019 extends ExpansionSet {
         cards.add(new SetCardInfo("Declare Dominance", 175, Rarity.UNCOMMON, mage.cards.d.DeclareDominance.class));
         cards.add(new SetCardInfo("Demon of Catastrophes", 91, Rarity.RARE, mage.cards.d.DemonOfCatastrophes.class));
         cards.add(new SetCardInfo("Desecrated Tomb", 230, Rarity.RARE, mage.cards.d.DesecratedTomb.class));
+        cards.add(new SetCardInfo("Diamond Mare", 231, Rarity.UNCOMMON, mage.cards.d.DiamondMare.class));
         cards.add(new SetCardInfo("Diregraf Ghoul", 92, Rarity.UNCOMMON, mage.cards.d.DiregrafGhoul.class));
         cards.add(new SetCardInfo("Disperse", 50, Rarity.COMMON, mage.cards.d.Disperse.class));
         cards.add(new SetCardInfo("Divination", 51, Rarity.COMMON, mage.cards.d.Divination.class));