YuGiOh Dark Legends Time Wizard DLG1-EN036 Rare [Toy]
Toss a coin and call it. If you call it right, destroy all monsters on your opponent's side of the field. If you call it wrong, destroy all monsters on your side of the field, and you lose Life Points equal to half the total ATK of the destroyed monsters. You can only use this effect once per turn, during your Main Phase.