diff --git a/Mage.Sets/src/mage/cards/a/AlpineHoundmaster.java b/Mage.Sets/src/mage/cards/a/AlpineHoundmaster.java
new file mode 100644
index 0000000000..adbd5c2f3a
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/a/AlpineHoundmaster.java
@@ -0,0 +1,140 @@
+package mage.cards.a;
+
+import mage.MageInt;
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.common.AttacksTriggeredAbility;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.dynamicvalue.common.PermanentsOnBattlefieldCount;
+import mage.abilities.dynamicvalue.common.StaticValue;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.continuous.BoostSourceEffect;
+import mage.cards.*;
+import mage.constants.*;
+import mage.filter.FilterCard;
+import mage.filter.FilterPermanent;
+import mage.filter.common.FilterAttackingCreature;
+import mage.filter.predicate.Predicates;
+import mage.filter.predicate.mageobject.NamePredicate;
+import mage.filter.predicate.permanent.AnotherPredicate;
+import mage.game.Game;
+import mage.players.Player;
+import mage.target.common.TargetCardInLibrary;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class AlpineHoundmaster extends CardImpl {
+
+    private static final FilterPermanent filter = new FilterAttackingCreature();
+
+    static {
+        filter.add(AnotherPredicate.instance);
+    }
+
+    private static final DynamicValue xValue = new PermanentsOnBattlefieldCount(filter);
+
+    public AlpineHoundmaster(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{R}{W}");
+
+        this.subtype.add(SubType.HUMAN);
+        this.subtype.add(SubType.WARRIOR);
+        this.power = new MageInt(2);
+        this.toughness = new MageInt(2);
+
+        // When Alpine Houndmaster enters the battlefield, you may search your library for a card named Alpine Watchdog and/or a card named Igneous Cur, reveal them, put them into your hand, then shuffle your library.
+        this.addAbility(new EntersBattlefieldTriggeredAbility(new AlpineHoundmasterEffect(), true));
+
+        // Whenever Alpine Houndmaster attacks, it gets +X/+0 until end of turn, where X is the number of other attacking creatures.
+        this.addAbility(new AttacksTriggeredAbility(new BoostSourceEffect(
+                xValue, StaticValue.get(0), Duration.EndOfTurn
+        ), false, "it gets +X/+0 until end of turn, where X is the number of other attacking creatures"));
+    }
+
+    private AlpineHoundmaster(final AlpineHoundmaster card) {
+        super(card);
+    }
+
+    @Override
+    public AlpineHoundmaster copy() {
+        return new AlpineHoundmaster(this);
+    }
+}
+
+class AlpineHoundmasterEffect extends OneShotEffect {
+
+    AlpineHoundmasterEffect() {
+        super(Outcome.Benefit);
+        staticText = "search your library for a card named Alpine Watchdog and/or a card named Igneous Cur, " +
+                "reveal them, put them into your hand, then shuffle your library";
+    }
+
+    private AlpineHoundmasterEffect(final AlpineHoundmasterEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public AlpineHoundmasterEffect copy() {
+        return new AlpineHoundmasterEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        if (player == null) {
+            return false;
+        }
+        TargetCardInLibrary target = new AlpineHoundmasterTarget();
+        player.searchLibrary(target, source, game);
+        Cards cards = new CardsImpl(target.getTargets());
+        player.revealCards(source, cards, game);
+        player.moveCards(cards, Zone.HAND, source, game);
+        player.shuffleLibrary(source, game);
+        return true;
+    }
+}
+
+class AlpineHoundmasterTarget extends TargetCardInLibrary {
+
+    private static final FilterCard filter
+            = new FilterCard("card named Alpine Watchdog and/or a card named Igneous Cur");
+
+    static {
+        filter.add(Predicates.or(
+                new NamePredicate("Alpine Watchdog"),
+                new NamePredicate("Igneous Cur")
+        ));
+    }
+
+    AlpineHoundmasterTarget() {
+        super(0, 2, filter);
+    }
+
+    private AlpineHoundmasterTarget(final AlpineHoundmasterTarget target) {
+        super(target);
+    }
+
+    @Override
+    public AlpineHoundmasterTarget copy() {
+        return new AlpineHoundmasterTarget(this);
+    }
+
+    @Override
+    public boolean canTarget(UUID controllerId, UUID id, Ability source, Game game) {
+        if (!super.canTarget(controllerId, id, source, game)) {
+            return false;
+        }
+        Card card = game.getCard(id);
+        if (card == null) {
+            return false;
+        }
+        return this.getTargets()
+                .stream()
+                .map(game::getCard)
+                .map(MageObject::getName)
+                .noneMatch(card.getName()::equals);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/CoreSet2021.java b/Mage.Sets/src/mage/sets/CoreSet2021.java
index ba0582fa24..789bf68f63 100644
--- a/Mage.Sets/src/mage/sets/CoreSet2021.java
+++ b/Mage.Sets/src/mage/sets/CoreSet2021.java
@@ -34,6 +34,7 @@ public final class CoreSet2021 extends ExpansionSet {
         this.maxCardNumberInBooster = 274;
 
         cards.add(new SetCardInfo("Adherent of Hope", 321, Rarity.COMMON, mage.cards.a.AdherentOfHope.class));
+        cards.add(new SetCardInfo("Alpine Houndmaster", 215, Rarity.UNCOMMON, mage.cards.a.AlpineHoundmaster.class));
         cards.add(new SetCardInfo("Angelic Ascension", 3, Rarity.UNCOMMON, mage.cards.a.AngelicAscension.class));
         cards.add(new SetCardInfo("Azusa, Lost but Seeking", 173, Rarity.RARE, mage.cards.a.AzusaLostButSeeking.class));
         cards.add(new SetCardInfo("Bad Deal", 89, Rarity.UNCOMMON, mage.cards.b.BadDeal.class));