diff --git a/Mage.Sets/src/mage/cards/p/PromiseOfLoyalty.java b/Mage.Sets/src/mage/cards/p/PromiseOfLoyalty.java
new file mode 100644
index 00000000000..1a0847bb96e
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/p/PromiseOfLoyalty.java
@@ -0,0 +1,137 @@
+package mage.cards.p;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.RestrictionEffect;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.counters.CounterType;
+import mage.filter.StaticFilters;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+import mage.target.TargetPermanent;
+import mage.target.common.TargetControlledCreaturePermanent;
+import mage.target.targetpointer.FixedTarget;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class PromiseOfLoyalty extends CardImpl {
+
+    public PromiseOfLoyalty(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.SORCERY}, "{4}{W}");
+
+        // Each player puts a vow counter on a creature they control and sacrifices the rest. Each of those creatures can't attack you or planeswalkers you control for as long as it has a vow counter on it.
+        this.getSpellAbility().addEffect(new PromiseOfLoyaltyEffect());
+    }
+
+    private PromiseOfLoyalty(final PromiseOfLoyalty card) {
+        super(card);
+    }
+
+    @Override
+    public PromiseOfLoyalty copy() {
+        return new PromiseOfLoyalty(this);
+    }
+}
+
+class PromiseOfLoyaltyEffect extends OneShotEffect {
+
+    PromiseOfLoyaltyEffect() {
+        super(Outcome.Benefit);
+        staticText = "each player puts a vow counter on a creature they control and sacrifices the rest. " +
+                "Each of those creatures can't attack you or planeswalkers you control for as long as it has a vow counter on it";
+    }
+
+    private PromiseOfLoyaltyEffect(final PromiseOfLoyaltyEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public PromiseOfLoyaltyEffect copy() {
+        return new PromiseOfLoyaltyEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        List<Permanent> permanents = new ArrayList<>();
+        for (UUID playerId : game.getState().getPlayersInRange(source.getControllerId(), game)) {
+            Player player = game.getPlayer(playerId);
+            if (player == null || game.getBattlefield().count(
+                    StaticFilters.FILTER_CONTROLLED_CREATURE,
+                    source.getSourceId(), playerId, game
+            ) < 1) {
+                continue;
+            }
+            TargetPermanent target = new TargetControlledCreaturePermanent();
+            target.setNotTarget(true);
+            player.choose(outcome, target, source.getSourceId(), game);
+            Permanent permanent = game.getPermanent(target.getFirstTarget());
+            if (permanent == null) {
+                continue;
+            }
+            permanents.add(permanent);
+            permanent.addCounters(CounterType.VOW.createInstance(), playerId, source, game);
+        }
+        for (Permanent permanent : game.getBattlefield().getActivePermanents(
+                StaticFilters.FILTER_PERMANENT_CREATURE, source.getSourceId(), game
+        )) {
+            if (permanent == null) {
+                continue;
+            }
+            if (permanents.contains(permanent)) {
+                game.addEffect(new PromiseOfLoyaltyAttackEffect().setTargetPointer(new FixedTarget(permanent, game)), source);
+            } else {
+                permanent.sacrifice(source, game);
+            }
+        }
+        return true;
+    }
+}
+
+class PromiseOfLoyaltyAttackEffect extends RestrictionEffect {
+
+    public PromiseOfLoyaltyAttackEffect() {
+        super(Duration.Custom);
+    }
+
+    public PromiseOfLoyaltyAttackEffect(final PromiseOfLoyaltyAttackEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public boolean applies(Permanent permanent, Ability source, Game game) {
+        Permanent p = game.getPermanent(getTargetPointer().getFirst(game, source));
+        if (p == null || p.getCounters(game).getCount(CounterType.VOW) < 1) {
+            discard();
+            return false;
+        }
+        return permanent.getId().equals(p.getId());
+    }
+
+    @Override
+    public boolean canAttack(Permanent attacker, UUID defenderId, Ability source, Game game, boolean canUseChooseDialogs) {
+        if (defenderId == null) {
+            return true;
+        }
+        if (source.isControlledBy(defenderId)) {
+            return false;
+        }
+        Permanent planeswalker = game.getPermanent(defenderId);
+        return planeswalker == null || !planeswalker.isControlledBy(source.getControllerId());
+    }
+
+
+    @Override
+    public PromiseOfLoyaltyAttackEffect copy() {
+        return new PromiseOfLoyaltyAttackEffect(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/Commander2021Edition.java b/Mage.Sets/src/mage/sets/Commander2021Edition.java
index 702aace5186..b8475dd56ce 100644
--- a/Mage.Sets/src/mage/sets/Commander2021Edition.java
+++ b/Mage.Sets/src/mage/sets/Commander2021Edition.java
@@ -230,6 +230,7 @@ public final class Commander2021Edition extends ExpansionSet {
         cards.add(new SetCardInfo("Ponder", 125, Rarity.COMMON, mage.cards.p.Ponder.class));
         cards.add(new SetCardInfo("Primal Empathy", 227, Rarity.UNCOMMON, mage.cards.p.PrimalEmpathy.class));
         cards.add(new SetCardInfo("Pristine Talisman", 258, Rarity.COMMON, mage.cards.p.PristineTalisman.class));
+        cards.add(new SetCardInfo("Promise of Loyalty", 21, Rarity.RARE, mage.cards.p.PromiseOfLoyalty.class));
         cards.add(new SetCardInfo("Pulse of Murasa", 202, Rarity.UNCOMMON, mage.cards.p.PulseOfMurasa.class));
         cards.add(new SetCardInfo("Pyromancer's Goggles", 259, Rarity.MYTHIC, mage.cards.p.PyromancersGoggles.class));
         cards.add(new SetCardInfo("Quicksmith Genius", 178, Rarity.UNCOMMON, mage.cards.q.QuicksmithGenius.class));