diff --git a/Mage.Sets/src/mage/cards/a/ArchelosLagoonMystic.java b/Mage.Sets/src/mage/cards/a/ArchelosLagoonMystic.java
new file mode 100644
index 00000000000..baed9ca6fca
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/a/ArchelosLagoonMystic.java
@@ -0,0 +1,88 @@
+package mage.cards.a;
+
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.effects.ReplacementEffectImpl;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.game.Game;
+import mage.game.events.EntersTheBattlefieldEvent;
+import mage.game.events.GameEvent;
+import mage.game.permanent.Permanent;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class ArchelosLagoonMystic extends CardImpl {
+
+    public ArchelosLagoonMystic(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{B}{G}{U}");
+
+        this.addSuperType(SuperType.LEGENDARY);
+        this.subtype.add(SubType.TURTLE);
+        this.subtype.add(SubType.SHAMAN);
+        this.power = new MageInt(2);
+        this.toughness = new MageInt(4);
+
+        // As long as Archelos, Lagoon Mystic is tapped, other permanents enter the battlefield tapped.
+        this.addAbility(new SimpleStaticAbility(new ArchelosLagoonMysticEffect(true)));
+
+        // As long as Archelos, Lagoon Mystic is untapped, other permanents enter the battlefield untapped.
+        this.addAbility(new SimpleStaticAbility(new ArchelosLagoonMysticEffect(false)));
+    }
+
+    private ArchelosLagoonMystic(final ArchelosLagoonMystic card) {
+        super(card);
+    }
+
+    @Override
+    public ArchelosLagoonMystic copy() {
+        return new ArchelosLagoonMystic(this);
+    }
+}
+
+class ArchelosLagoonMysticEffect extends ReplacementEffectImpl {
+
+    private final boolean tapped;
+
+    ArchelosLagoonMysticEffect(boolean tapped) {
+        super(Duration.WhileOnBattlefield, Outcome.Benefit);
+        this.tapped = tapped;
+        staticText = "as long as {this} is "
+                + (tapped ? "" : "un") + "tapped, other permanents enter the battlefield "
+                + (tapped ? "" : "un") + "tapped";
+    }
+
+    private ArchelosLagoonMysticEffect(final ArchelosLagoonMysticEffect effect) {
+        super(effect);
+        this.tapped = effect.tapped;
+    }
+
+    @Override
+    public boolean replaceEvent(GameEvent event, Ability source, Game game) {
+        Permanent target = ((EntersTheBattlefieldEvent) event).getTarget();
+        if (target != null) {
+            target.setTapped(tapped);
+        }
+        return false;
+    }
+
+    @Override
+    public boolean checksEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.ENTERS_THE_BATTLEFIELD;
+    }
+
+    @Override
+    public boolean applies(GameEvent event, Ability source, Game game) {
+        return !source.getSourceId().equals(((EntersTheBattlefieldEvent) event).getTarget().getId());
+    }
+
+    @Override
+    public ArchelosLagoonMysticEffect copy() {
+        return new ArchelosLagoonMysticEffect(this);
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/CommanderLegends.java b/Mage.Sets/src/mage/sets/CommanderLegends.java
index 3d49f05ee25..9c77d75ebbf 100644
--- a/Mage.Sets/src/mage/sets/CommanderLegends.java
+++ b/Mage.Sets/src/mage/sets/CommanderLegends.java
@@ -35,6 +35,7 @@ public final class CommanderLegends extends ExpansionSet {
         cards.add(new SetCardInfo("Ancient Animus", 215, Rarity.COMMON, mage.cards.a.AncientAnimus.class));
         cards.add(new SetCardInfo("Apex Devastator", 217, Rarity.MYTHIC, mage.cards.a.ApexDevastator.class));
         cards.add(new SetCardInfo("Arcane Signet", 297, Rarity.UNCOMMON, mage.cards.a.ArcaneSignet.class));
+        cards.add(new SetCardInfo("Archelos, Lagoon Mystic", 268, Rarity.RARE, mage.cards.a.ArchelosLagoonMystic.class));
         cards.add(new SetCardInfo("Archon of Coronation", 9, Rarity.MYTHIC, mage.cards.a.ArchonOfCoronation.class));
         cards.add(new SetCardInfo("Armillary Sphere", 298, Rarity.COMMON, mage.cards.a.ArmillarySphere.class));
         cards.add(new SetCardInfo("Armix, Filigree Thrasher", 108, Rarity.UNCOMMON, mage.cards.a.ArmixFiligreeThrasher.class));