diff --git a/Mage.Sets/src/mage/cards/t/ThornmantleStriker.java b/Mage.Sets/src/mage/cards/t/ThornmantleStriker.java
new file mode 100644
index 00000000000..5dc657323e8
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/t/ThornmantleStriker.java
@@ -0,0 +1,118 @@
+package mage.cards.t;
+
+import java.util.UUID;
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.Mode;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.dynamicvalue.common.PermanentsOnBattlefieldCount;
+import mage.abilities.dynamicvalue.common.SignInversionDynamicValue;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.continuous.BoostTargetEffect;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.filter.common.FilterControlledPermanent;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+import mage.target.TargetPermanent;
+import mage.target.common.TargetOpponentsCreaturePermanent;
+
+/**
+ *
+ * @author weirddan455
+ */
+public final class ThornmantleStriker extends CardImpl {
+
+    private static final PermanentsOnBattlefieldCount elfCount
+            = new PermanentsOnBattlefieldCount(new FilterControlledPermanent(SubType.ELF));
+    private static final SignInversionDynamicValue negativeElfCount
+            = new SignInversionDynamicValue(elfCount);
+
+    public ThornmantleStriker(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{4}{B}");
+
+        this.subtype.add(SubType.ELF);
+        this.subtype.add(SubType.ROGUE);
+        this.power = new MageInt(4);
+        this.toughness = new MageInt(3);
+
+        // When Thornmantle Striker enters the battlefield, choose one —
+        // • Remove X counters from target permanent, where X is the number of Elves you control.
+        Ability ability = new EntersBattlefieldTriggeredAbility(new ThornmantleStrikerEffect(elfCount));
+        ability.addTarget(new TargetPermanent());
+
+        // • Target creature an opponent controls gets -X/-X until end of turn, where X is the number of Elves you control.
+        Mode mode = new Mode(new BoostTargetEffect(negativeElfCount, negativeElfCount, Duration.EndOfTurn, true
+        ).setText("Target creature an opponent controls gets -X/-X until end of turn, where X is the number of Elves you control"));
+        mode.addTarget(new TargetOpponentsCreaturePermanent());
+
+        ability.addMode(mode);
+        this.addAbility(ability);
+    }
+
+    private ThornmantleStriker(final ThornmantleStriker card) {
+        super(card);
+    }
+
+    @Override
+    public ThornmantleStriker copy() {
+        return new ThornmantleStriker(this);
+    }
+}
+
+class ThornmantleStrikerEffect extends OneShotEffect {
+
+    private final DynamicValue xValue;
+
+    ThornmantleStrikerEffect(DynamicValue xValue) {
+        super(Outcome.AIDontUseIt);
+        staticText = "Remove X counters from target permanent, where X is the number of Elves you control";
+        this.xValue = xValue;
+    }
+
+    private ThornmantleStrikerEffect(final ThornmantleStrikerEffect effect) {
+        super(effect);
+        this.xValue = effect.xValue.copy();
+    }
+
+    @Override
+    public ThornmantleStrikerEffect copy() {
+        return new ThornmantleStrikerEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player controller = game.getPlayer(source.getControllerId());
+        Permanent permanent = game.getPermanent(source.getFirstTarget());
+        if (controller != null && permanent != null) {
+            int toRemove = xValue.calculate(game, source, this);
+            int removed = 0;
+            String[] counterNames = permanent.getCounters(game).keySet().toArray(new String[0]);
+            for (String counterName : counterNames) {
+                if (controller.chooseUse(Outcome.Neutral, "Do you want to remove " + counterName + " counters?", source, game)) {
+                    if (permanent.getCounters(game).get(counterName).getCount() == 1 || (toRemove - removed == 1)) {
+                        permanent.removeCounters(counterName, 1, source, game);
+                        removed++;
+                    } else {
+                        int amount = controller.getAmount(1, Math.min(permanent.getCounters(game).get(counterName).getCount(), toRemove - removed), "How many?", game);
+                        if (amount > 0) {
+                            removed += amount;
+                            permanent.removeCounters(counterName, amount, source, game);
+                        }
+                    }
+                }
+                if (removed >= toRemove) {
+                    break;
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/Kaldheim.java b/Mage.Sets/src/mage/sets/Kaldheim.java
index f22fd896f3b..56adf112d48 100644
--- a/Mage.Sets/src/mage/sets/Kaldheim.java
+++ b/Mage.Sets/src/mage/sets/Kaldheim.java
@@ -55,6 +55,7 @@ public final class Kaldheim extends ExpansionSet {
         cards.add(new SetCardInfo("Starnheim Aspirant", 380, Rarity.UNCOMMON, mage.cards.s.StarnheimAspirant.class));
         cards.add(new SetCardInfo("Surtland Elementalist", 375, Rarity.RARE, mage.cards.s.SurtlandElementalist.class));
         cards.add(new SetCardInfo("Surtland Flinger", 377, Rarity.RARE, mage.cards.s.SurtlandFlinger.class));
+        cards.add(new SetCardInfo("Thornmantle Striker", 387, Rarity.UNCOMMON, mage.cards.t.ThornmantleStriker.class));
         cards.add(new SetCardInfo("Toski, Bearer of Secrets", 197, Rarity.RARE, mage.cards.t.ToskiBearerOfSecrets.class));
         cards.add(new SetCardInfo("Valkyrie Harbinger", 374, Rarity.RARE, mage.cards.v.ValkyrieHarbinger.class));
         cards.add(new SetCardInfo("Warchanter Skald", 381, Rarity.UNCOMMON, mage.cards.w.WarchanterSkald.class));