diff --git a/Mage.Sets/src/mage/cards/u/UnbreakableFormation.java b/Mage.Sets/src/mage/cards/u/UnbreakableFormation.java
new file mode 100644
index 00000000000..2c53b53b4a3
--- /dev/null
+++ b/Mage.Sets/src/mage/cards/u/UnbreakableFormation.java
@@ -0,0 +1,79 @@
+package mage.cards.u;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.common.AddendumCondition;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.continuous.GainAbilityControlledEffect;
+import mage.abilities.effects.common.counter.AddCountersAllEffect;
+import mage.abilities.keyword.IndestructibleAbility;
+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 java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class UnbreakableFormation extends CardImpl {
+
+    public UnbreakableFormation(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{2}{W}");
+
+        // Creatures you control gain indestructible until end of turn.
+        this.getSpellAbility().addEffect(new GainAbilityControlledEffect(
+                IndestructibleAbility.getInstance(), Duration.EndOfTurn,
+                StaticFilters.FILTER_PERMANENT_CREATURE
+        ));
+
+        // Addendum — If you cast this spell during your main phase, put a +1/+1 counter on each of those creatures, and they also gain vigilance until end of turn.
+        this.getSpellAbility().addEffect(new UnbreakableFormationEffect());
+    }
+
+    private UnbreakableFormation(final UnbreakableFormation card) {
+        super(card);
+    }
+
+    @Override
+    public UnbreakableFormation copy() {
+        return new UnbreakableFormation(this);
+    }
+}
+
+class UnbreakableFormationEffect extends OneShotEffect {
+
+    UnbreakableFormationEffect() {
+        super(Outcome.Benefit);
+        staticText = "<br><i>Addendum</i> &mdash; If you cast this spell during your main phase, " +
+                "put a +1/+1 counter on each of those creatures, and they also gain vigilance until end of turn.";
+    }
+
+    private UnbreakableFormationEffect(final UnbreakableFormationEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public UnbreakableFormationEffect copy() {
+        return new UnbreakableFormationEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        if (!AddendumCondition.instance.apply(game, source)) {
+            return false;
+        }
+        game.addEffect(new GainAbilityControlledEffect(
+                IndestructibleAbility.getInstance(), Duration.EndOfTurn,
+                StaticFilters.FILTER_PERMANENT_CREATURE
+        ), source);
+        return new AddCountersAllEffect(
+                CounterType.P1P1.createInstance(),
+                StaticFilters.FILTER_CONTROLLED_CREATURE
+        ).apply(game, source);
+    }
+}
\ No newline at end of file
diff --git a/Mage.Sets/src/mage/sets/RavnicaAllegiance.java b/Mage.Sets/src/mage/sets/RavnicaAllegiance.java
index 68c6b8692bc..cd845434ad9 100644
--- a/Mage.Sets/src/mage/sets/RavnicaAllegiance.java
+++ b/Mage.Sets/src/mage/sets/RavnicaAllegiance.java
@@ -142,6 +142,7 @@ public final class RavnicaAllegiance extends ExpansionSet {
         cards.add(new SetCardInfo("Titanic Brawl", 146, Rarity.COMMON, mage.cards.t.TitanicBrawl.class));
         cards.add(new SetCardInfo("Tithe Taker", 27, Rarity.RARE, mage.cards.t.TitheTaker.class));
         cards.add(new SetCardInfo("Trollbred Guardian", 148, Rarity.UNCOMMON, mage.cards.t.TrollbredGuardian.class));
+        cards.add(new SetCardInfo("Unbreakable Formation", 29, Rarity.RARE, mage.cards.u.UnbreakableFormation.class));
         cards.add(new SetCardInfo("Verity Circle", 58, Rarity.RARE, mage.cards.v.VerityCircle.class));
         cards.add(new SetCardInfo("Warrant // Warden", 230, Rarity.RARE, mage.cards.w.WarrantWarden.class));
         cards.add(new SetCardInfo("Wilderness Reclamation", 149, Rarity.UNCOMMON, mage.cards.w.WildernessReclamation.class));