diff --git a/Mage.Sets/src/mage/cards/s/SinUnendingCataclysm.java b/Mage.Sets/src/mage/cards/s/SinUnendingCataclysm.java
new file mode 100644
index 00000000000..243b8d02f25
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/s/SinUnendingCataclysm.java
@@ -0,0 +1,135 @@
+package mage.cards.s;
+
+import mage.MageInt;
+import mage.abilities.Ability;
+import mage.abilities.common.AsEntersBattlefieldAbility;
+import mage.abilities.common.DiesSourceTriggeredAbility;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.PutSourceCountersOnTargetEffect;
+import mage.abilities.effects.common.ShuffleIntoLibrarySourceEffect;
+import mage.abilities.keyword.FlyingAbility;
+import mage.abilities.keyword.TrampleAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.constants.SuperType;
+import mage.counters.Counter;
+import mage.counters.CounterType;
+import mage.filter.FilterPermanent;
+import mage.filter.predicate.Predicates;
+import mage.filter.predicate.permanent.CounterAnyPredicate;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+import mage.target.TargetPermanent;
+import mage.target.common.TargetControlledCreaturePermanent;
+
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+/**
+ * @author TheElk801
+ */
+public final class SinUnendingCataclysm extends CardImpl {
+
+    public SinUnendingCataclysm(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{5}{G}{U}");
+
+        this.supertype.add(SuperType.LEGENDARY);
+        this.subtype.add(SubType.LEVIATHAN);
+        this.subtype.add(SubType.AVATAR);
+        this.power = new MageInt(5);
+        this.toughness = new MageInt(5);
+
+        // Flying
+        this.addAbility(FlyingAbility.getInstance());
+
+        // Trample
+        this.addAbility(TrampleAbility.getInstance());
+
+        // As Sin enters, remove all counters from any number of artifacts, creatures, and enchantments. Sin enters with X +1/+1 counters on it, where X is twice the number of counters removed this way.
+        this.addAbility(new AsEntersBattlefieldAbility(new SinUnendingCataclysmEffect()));
+
+        // When Sin dies, put its counters on target creature you control, then shuffle this card into its owner's library.
+        Ability ability = new DiesSourceTriggeredAbility(new PutSourceCountersOnTargetEffect());
+        ability.addEffect(new ShuffleIntoLibrarySourceEffect().setText(", then shuffle this card into its owner's library"));
+        ability.addTarget(new TargetControlledCreaturePermanent());
+        this.addAbility(ability);
+    }
+
+    private SinUnendingCataclysm(final SinUnendingCataclysm card) {
+        super(card);
+    }
+
+    @Override
+    public SinUnendingCataclysm copy() {
+        return new SinUnendingCataclysm(this);
+    }
+}
+
+class SinUnendingCataclysmEffect extends OneShotEffect {
+
+    private static final FilterPermanent filter = new FilterPermanent("artifacts, creatures, and enchantments");
+
+    static {
+        filter.add(Predicates.or(
+                CardType.ARTIFACT.getPredicate(),
+                CardType.CREATURE.getPredicate(),
+                CardType.ENCHANTMENT.getPredicate()
+        ));
+        filter.add(CounterAnyPredicate.instance);
+    }
+
+    SinUnendingCataclysmEffect() {
+        super(Outcome.Benefit);
+        staticText = "remove all counters from any number of artifacts, creatures, and enchantments. " +
+                "{this} enters with X +1/+1 counters on it, where X is twice the number of counters removed this way";
+    }
+
+    private SinUnendingCataclysmEffect(final SinUnendingCataclysmEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public SinUnendingCataclysmEffect copy() {
+        return new SinUnendingCataclysmEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        if (player == null) {
+            return false;
+        }
+        TargetPermanent target = new TargetPermanent(0, Integer.MAX_VALUE, filter, true);
+        player.choose(outcome, target, source, game);
+        int count = 0;
+        for (UUID targetId : target.getTargets()) {
+            Permanent permanent = game.getPermanent(targetId);
+            if (permanent == null) {
+                continue;
+            }
+            Set<Counter> counters = permanent.getCounters(game)
+                    .entrySet()
+                    .stream()
+                    .map(e -> CounterType.findByName(e.getKey()).createInstance(e.getValue().getCount()))
+                    .collect(Collectors.toSet());
+            for (Counter counter : counters) {
+                count += permanent.removeCounters(counter, source, game);
+            }
+        }
+        if (count < 1) {
+            return false;
+        }
+        Counter counter = CounterType.P1P1.createInstance(2 * count);
+        Optional.ofNullable(source)
+                .map(Ability::getSourceId)
+                .map(game::getPermanentEntering)
+                .ifPresent(permanent -> permanent.addCounters(counter, source, game));
+        return true;
+    }
+}
diff --git a/Mage.Sets/src/mage/sets/FinalFantasyCommander.java b/Mage.Sets/src/mage/sets/FinalFantasyCommander.java
index c08bf34afe2..b13ea9739ed 100644
--- a/Mage.Sets/src/mage/sets/FinalFantasyCommander.java
+++ b/Mage.Sets/src/mage/sets/FinalFantasyCommander.java
@@ -302,6 +302,8 @@ public final class FinalFantasyCommander extends ExpansionSet {
         cards.add(new SetCardInfo("Shineshadow Snarl", 422, Rarity.RARE, mage.cards.s.ShineshadowSnarl.class));
         cards.add(new SetCardInfo("Siegfried, Famed Swordsman", 149, Rarity.RARE, mage.cards.s.SiegfriedFamedSwordsman.class, NON_FULL_USE_VARIOUS));
         cards.add(new SetCardInfo("Siegfried, Famed Swordsman", 51, Rarity.RARE, mage.cards.s.SiegfriedFamedSwordsman.class, NON_FULL_USE_VARIOUS));
+        cards.add(new SetCardInfo("Sin, Unending Cataclysm", 185, Rarity.RARE, mage.cards.s.SinUnendingCataclysm.class, NON_FULL_USE_VARIOUS));
+        cards.add(new SetCardInfo("Sin, Unending Cataclysm", 95, Rarity.RARE, mage.cards.s.SinUnendingCataclysm.class, NON_FULL_USE_VARIOUS));
         cards.add(new SetCardInfo("Skullclamp", 355, Rarity.UNCOMMON, mage.cards.s.Skullclamp.class));
         cards.add(new SetCardInfo("Skycloud Expanse", 423, Rarity.RARE, mage.cards.s.SkycloudExpanse.class));
         cards.add(new SetCardInfo("Slayers' Stronghold", 424, Rarity.RARE, mage.cards.s.SlayersStronghold.class));