Two fatties become one. The card's info says: BUBN-EN055: Merge Muffins Normal Spell Fusion Summon 1 BC Fusion Monster (from your Extra Deck) by banishing BC monsters listed on it from your Grave. Your opponent cannot activate cards or effects in response to this Fusion Summon. You can only activate 1 "Merge Muffins" per turn. (Rare)