diff --git a/Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/BestowTest.java b/Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/BestowTest.java
index 017aa0d9c96..c684ea65402 100644
--- a/Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/BestowTest.java
+++ b/Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/BestowTest.java
@@ -231,5 +231,45 @@ public class BestowTest extends CardTestPlayerBase {
         assertPermanentCount(playerA, "Nyxborn Rollicker", 0);
         assertGraveyardCount(playerA, "Nyxborn Rollicker", 1);
         
-    }      
+    }
+
+    /**
+     * Test that CMC of a spell cast with bestowed is correct
+     * Disdainful Stroke doesn't check converted mana cost correctly. Opponent was
+     * able to use it to counter a Hypnotic Siren cast with Bestow.
+     */
+    @Test
+    public void bestowCheckForCorrectCMC() {
+        addCard(Zone.BATTLEFIELD, playerA, "Island", 7);
+        // Enchantment Creature — Siren
+        // 1/1
+        // Bestow {5}{U}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
+        // Flying
+        // You control enchanted creature.
+        // Enchanted creature gets +1/+1 and has flying.
+        addCard(Zone.HAND, playerA, "Hypnotic Siren");
+        // Instant {1}{U}
+        // Counter target spell with converted mana cost 4 or greater.
+        addCard(Zone.HAND, playerB, "Disdainful Stroke");
+        addCard(Zone.BATTLEFIELD, playerB, "Island", 2);
+
+        addCard(Zone.BATTLEFIELD, playerB, "Silvercoat Lion");
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Hypnotic Siren using bestow", "Silvercoat Lion");
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerB, "Disdainful Stroke", "Hypnotic Siren");
+
+        setStopAt(1, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        //
+        assertHandCount(playerA, "Hypnotic Siren", 0);
+        assertGraveyardCount(playerA, "Hypnotic Siren", 0);
+        assertHandCount(playerB, "Disdainful Stroke", 1);
+        assertPermanentCount(playerA, "Hypnotic Siren", 1);
+
+        // because cast with bestow, Boon Satyr may not be tapped
+        assertPermanentCount(playerA, "Silvercoat Lion", 1);
+        assertPowerToughness(playerA, "Silvercoat Lion", 3,3);
+
+    }
 }
diff --git a/Mage/src/mage/abilities/keyword/BestowAbility.java b/Mage/src/mage/abilities/keyword/BestowAbility.java
index 6f933711cc3..5c3c1823904 100644
--- a/Mage/src/mage/abilities/keyword/BestowAbility.java
+++ b/Mage/src/mage/abilities/keyword/BestowAbility.java
@@ -41,6 +41,7 @@ import mage.constants.Duration;
 import mage.constants.Layer;
 import static mage.constants.Layer.TypeChangingEffects_4;
 import mage.constants.Outcome;
+import mage.constants.SpellAbilityType;
 import mage.constants.SubLayer;
 import mage.constants.TimingRule;
 import mage.constants.Zone;
@@ -108,6 +109,7 @@ public class BestowAbility extends SpellAbility {
 
     public BestowAbility(Card card, String manaString) {
         super(new ManaCostsImpl(manaString), card.getName() + " using bestow");
+        this.spellAbilityType = SpellAbilityType.BASE_ALTERNATE;
         this.timing = TimingRule.SORCERY;
         TargetPermanent auraTarget = new TargetCreaturePermanent();
         this.addTarget(auraTarget);
diff --git a/Mage/src/mage/game/stack/Spell.java b/Mage/src/mage/game/stack/Spell.java
index 2ea2c858ebd..bed5d9ac863 100644
--- a/Mage/src/mage/game/stack/Spell.java
+++ b/Mage/src/mage/game/stack/Spell.java
@@ -28,6 +28,9 @@
 
 package mage.game.stack;
 
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
 import mage.MageInt;
 import mage.MageObject;
 import mage.Mana;
@@ -47,7 +50,11 @@ import mage.abilities.keyword.BestowAbility;
 import mage.abilities.keyword.MorphAbility;
 import mage.cards.Card;
 import mage.cards.SplitCard;
-import mage.constants.*;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.constants.Rarity;
+import mage.constants.SpellAbilityType;
+import mage.constants.Zone;
 import mage.counters.Counter;
 import mage.counters.Counters;
 import mage.game.Game;
@@ -59,10 +66,6 @@ import mage.target.Target;
 import mage.target.TargetAmount;
 import mage.watchers.Watcher;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.UUID;
-
 /**
  *
  * @author BetaSteward_at_googlemail.com
@@ -181,7 +184,7 @@ public class Spell implements StackObject, Card {
                 // if muliple modes are selected, and there are modes with targets, then at least one mode has to have a legal target or 
                 // When resolving a fused split spell with multiple targets, treat it as you would any spell with multiple targets. 
                 // If all targets are illegal when the spell tries to resolve, the spell is countered and none of its effects happen. 
-                // If at least one target is still legal at that time, the spell resolves, but an illegal target can’t perform any actions
+                // If at least one target is still legal at that time, the spell resolves, but an illegal target can't perform any actions
                 // or have any actions performed on it. 
                 legalParts |= spellAbilityHasLegalParts(spellAbility, game);
             }
@@ -635,7 +638,14 @@ public class Spell implements StackObject, Card {
                     index = symbolString.indexOf("{X}");
                 }
             }
-            cmc += spellAbility.getManaCosts().convertedManaCost() + spellAbility.getManaCostsToPay().getX() * xMultiplier;
+            if (this.getSpellAbility().getSpellAbilityType().equals(SpellAbilityType.BASE_ALTERNATE)) {
+                cmc += spellAbility.getManaCostsToPay().getX() * xMultiplier;
+            } else {
+                cmc += spellAbility.getManaCosts().convertedManaCost() + spellAbility.getManaCostsToPay().getX() * xMultiplier;
+            }
+        }
+        if (this.getSpellAbility().getSpellAbilityType().equals(SpellAbilityType.BASE_ALTERNATE)) {
+            cmc += getCard().getManaCost().convertedManaCost();
         }
         return cmc;
     }