Cannot be Normal Summoned or Set. Must be Special Summoned by "Yubel". Cannot be destroyed by battle. You take no battle damage from battles involving this card. Before damage calculation, if this face-up Attack Position card is targeted for an attack: Inflict damage to your opponent equal to that attacking monster's ATK. Once per turn, during your End Phase: Destroy all other monsters on the field. When this face-up card leaves the field: You can Special Summon 1 "Yubel - The Ultimate Nightmare" from your hand, Deck, or GY.