diff --git a/Mage.Sets/src/mage/cards/t/ThornLieutenant.java b/Mage.Sets/src/mage/cards/t/ThornLieutenant.java
new file mode 100644
index 00000000000..11ba8e88dc8
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/t/ThornLieutenant.java
@@ -0,0 +1,53 @@
+package mage.cards.t;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.abilities.common.BecomesTargetTriggeredAbility;
+import mage.abilities.common.SimpleActivatedAbility;
+import mage.abilities.costs.mana.ManaCostsImpl;
+import mage.abilities.effects.common.CreateTokenEffect;
+import mage.abilities.effects.common.continuous.BoostSourceEffect;
+import mage.constants.SubType;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.filter.StaticFilters;
+import mage.game.permanent.token.ElfToken;
+
+/**
+ *
+ * @author TheElk801
+ */
+public final class ThornLieutenant extends CardImpl {
+
+    public ThornLieutenant(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{G}");
+
+        this.subtype.add(SubType.ELF);
+        this.subtype.add(SubType.WARRIOR);
+        this.power = new MageInt(2);
+        this.toughness = new MageInt(3);
+
+        // Whenever Thorn Lieutenant becomes the target of a spell or ability an opponent controls, create a 1/1 green Elf Warrior creature token.
+        this.addAbility(new BecomesTargetTriggeredAbility(
+                new CreateTokenEffect(new ElfToken()),
+                StaticFilters.FILTER_SPELL_OR_ABILITY_OPPONENTS
+        ));
+
+        // {5}{G}: Thorn Lieutenant gets +4/+4 until end of turn.
+        this.addAbility(new SimpleActivatedAbility(
+                new BoostSourceEffect(4, 4, Duration.EndOfTurn),
+                new ManaCostsImpl("{5}{G}")
+        ));
+    }
+
+    public ThornLieutenant(final ThornLieutenant card) {
+        super(card);
+    }
+
+    @Override
+    public ThornLieutenant copy() {
+        return new ThornLieutenant(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/CoreSet2019.java b/Mage.Sets/src/mage/sets/CoreSet2019.java
index c10cb0ee9f9..0f636441b58 100644
--- a/Mage.Sets/src/mage/sets/CoreSet2019.java
+++ b/Mage.Sets/src/mage/sets/CoreSet2019.java
@@ -239,6 +239,7 @@ public final class CoreSet2019 extends ExpansionSet {
         cards.add(new SetCardInfo("Tezzeret's Gatebreaker", 289, Rarity.RARE, mage.cards.t.TezzeretsGatebreaker.class));
         cards.add(new SetCardInfo("Tezzeret's Strider", 290, Rarity.UNCOMMON, mage.cards.t.TezzeretsStrider.class));
         cards.add(new SetCardInfo("Tezzeret, Cruel Machinist", 286, Rarity.MYTHIC, mage.cards.t.TezzeretCruelMachinist.class));
+        cards.add(new SetCardInfo("Thorn Lieutenant", 203, Rarity.RARE, mage.cards.t.ThornLieutenant.class));
         cards.add(new SetCardInfo("Thornhide Wolves", 204, Rarity.COMMON, mage.cards.t.ThornhideWolves.class));
         cards.add(new SetCardInfo("Thud", 163, Rarity.UNCOMMON, mage.cards.t.Thud.class));
         cards.add(new SetCardInfo("Timber Gorge", 258, Rarity.COMMON, mage.cards.t.TimberGorge.class));
diff --git a/Mage/src/main/java/mage/abilities/common/BecomesTargetTriggeredAbility.java b/Mage/src/main/java/mage/abilities/common/BecomesTargetTriggeredAbility.java
index 750dc8cd374..54263a11bc1 100644
--- a/Mage/src/main/java/mage/abilities/common/BecomesTargetTriggeredAbility.java
+++ b/Mage/src/main/java/mage/abilities/common/BecomesTargetTriggeredAbility.java
@@ -5,6 +5,7 @@ import mage.abilities.TriggeredAbilityImpl;
 import mage.abilities.effects.Effect;
 import mage.constants.Zone;
 import mage.filter.FilterStackObject;
+import mage.filter.StaticFilters;
 import mage.game.Game;
 import mage.game.events.GameEvent;
 import mage.game.stack.StackObject;
@@ -18,7 +19,7 @@ public class BecomesTargetTriggeredAbility extends TriggeredAbilityImpl {
     private final FilterStackObject filter;
 
     public BecomesTargetTriggeredAbility(Effect effect) {
-        this(effect, new FilterStackObject("a spell or ability"));
+        this(effect, StaticFilters.FILTER_SPELL_OR_ABILITY);
     }
 
     public BecomesTargetTriggeredAbility(Effect effect, FilterStackObject filter) {
diff --git a/Mage/src/main/java/mage/filter/StaticFilters.java b/Mage/src/main/java/mage/filter/StaticFilters.java
index 96828dbc587..0fcf903c4c3 100644
--- a/Mage/src/main/java/mage/filter/StaticFilters.java
+++ b/Mage/src/main/java/mage/filter/StaticFilters.java
@@ -388,6 +388,17 @@ public final class StaticFilters {
     static {
         FILTER_PERMANENTS_NON_LAND.setLockedFilter(true);
     }
+    public static final FilterStackObject FILTER_SPELL_OR_ABILITY_OPPONENTS = new FilterStackObject("spell or ability and opponent controls");
+
+    static {
+        FILTER_SPELL_OR_ABILITY_OPPONENTS.add(new ControllerPredicate(TargetController.OPPONENT));
+        FILTER_SPELL_OR_ABILITY_OPPONENTS.setLockedFilter(true);
+    }
+    public static final FilterStackObject FILTER_SPELL_OR_ABILITY = new FilterStackObject();
+
+    static {
+        FILTER_SPELL_OR_ABILITY.setLockedFilter(true);
+    }
 
     public static final FilterCreatureSpell FILTER_SPELL_A_CREATURE = new FilterCreatureSpell("a creature spell");