diff --git a/Mage.Sets/src/mage/cards/s/SwordswornCavalier.java b/Mage.Sets/src/mage/cards/s/SwordswornCavalier.java
new file mode 100644
index 0000000000..d18fdb16b9
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/s/SwordswornCavalier.java
@@ -0,0 +1,90 @@
+package mage.cards.s;
+
+import mage.MageInt;
+import mage.MageObjectReference;
+import mage.abilities.Ability;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.decorator.ConditionalContinuousEffect;
+import mage.abilities.effects.common.continuous.GainAbilitySourceEffect;
+import mage.abilities.keyword.FirstStrikeAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Duration;
+import mage.constants.SubType;
+import mage.constants.WatcherScope;
+import mage.game.Game;
+import mage.game.events.EntersTheBattlefieldEvent;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+import mage.watchers.Watcher;
+
+import java.util.*;
+
+/**
+ * @author TheElk801
+ */
+public final class SwordswornCavalier extends CardImpl {
+
+    public SwordswornCavalier(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{W}");
+
+        this.subtype.add(SubType.HUMAN);
+        this.subtype.add(SubType.KNIGHT);
+        this.power = new MageInt(3);
+        this.toughness = new MageInt(1);
+
+        // Swordsworn Cavalier has first strike as long as another Knight entered the battlefield under your control this turn.
+        this.addAbility(new SimpleStaticAbility(new ConditionalContinuousEffect(
+                new GainAbilitySourceEffect(FirstStrikeAbility.getInstance(), Duration.WhileOnBattlefield),
+                SwordswornCavalierWatcher::checkPermanent, "{this} has first strike as long as " +
+                "another Knight entered the battlefield under your control this turn"
+        )), new SwordswornCavalierWatcher());
+    }
+
+    private SwordswornCavalier(final SwordswornCavalier card) {
+        super(card);
+    }
+
+    @Override
+    public SwordswornCavalier copy() {
+        return new SwordswornCavalier(this);
+    }
+}
+
+class SwordswornCavalierWatcher extends Watcher {
+
+    private final Map<UUID, Set<MageObjectReference>> map = new HashMap<>();
+
+    SwordswornCavalierWatcher() {
+        super(WatcherScope.GAME);
+    }
+
+    @Override
+    public void watch(GameEvent event, Game game) {
+        if (event.getType() != GameEvent.EventType.ENTERS_THE_BATTLEFIELD) {
+            return;
+        }
+        Permanent permanent = ((EntersTheBattlefieldEvent) event).getTarget();
+        if (permanent.hasSubtype(SubType.KNIGHT, game)) {
+            map.computeIfAbsent(permanent.getControllerId(), x -> new HashSet<>())
+                    .add(new MageObjectReference(permanent, game));
+        }
+    }
+
+    @Override
+    public void reset() {
+        super.reset();
+        map.clear();
+    }
+
+    static boolean checkPermanent(Game game, Ability source) {
+        return game
+                .getState()
+                .getWatcher(SwordswornCavalierWatcher.class)
+                .map
+                .getOrDefault(source.getControllerId(), Collections.emptySet())
+                .stream()
+                .anyMatch(mor -> !mor.refersTo(source, game));
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/MarchOfTheMachine.java b/Mage.Sets/src/mage/sets/MarchOfTheMachine.java
index 5cd0c3b702..c4f19b083d 100644
--- a/Mage.Sets/src/mage/sets/MarchOfTheMachine.java
+++ b/Mage.Sets/src/mage/sets/MarchOfTheMachine.java
@@ -213,6 +213,7 @@ public final class MarchOfTheMachine extends ExpansionSet {
         cards.add(new SetCardInfo("Sunfall", 40, Rarity.RARE, mage.cards.s.Sunfall.class));
         cards.add(new SetCardInfo("Swamp", 279, Rarity.LAND, mage.cards.basiclands.Swamp.class, NON_FULL_USE_VARIOUS));
         cards.add(new SetCardInfo("Swiftwater Cliffs", 273, Rarity.COMMON, mage.cards.s.SwiftwaterCliffs.class));
+        cards.add(new SetCardInfo("Swordsworn Cavalier", 42, Rarity.COMMON, mage.cards.s.SwordswornCavalier.class));
         cards.add(new SetCardInfo("Tangled Skyline", 209, Rarity.UNCOMMON, mage.cards.t.TangledSkyline.class));
         cards.add(new SetCardInfo("Tarkir Duneshaper", 43, Rarity.COMMON, mage.cards.t.TarkirDuneshaper.class));
         cards.add(new SetCardInfo("Tenured Oilcaster", 126, Rarity.COMMON, mage.cards.t.TenuredOilcaster.class));