| Set: | Phantom Nightmare |
| Card type: | Normal Spell |
| Rarity: | Quarter Century Secret Rare |
Tribute 1 Fusion or Synchro Monster; Special Summon 1 monster from your Deck with the same Level as the Tributed monster's original Level, but return it to the hand during the End Phase. You can only activate 1 "Mutamorphosis" per turn.