Yubel - The Ultimate Nightmare (Quarter Century Secret Rare)

Cannot be Normal Summoned or Set. Must be Special Summoned by "Yubel - Terror Incarnate". Cannot be destroyed by battle. You take no battle damage from battles involving this card. At the end of the Damage Step, if this face-up Attack Position card battled an opponent's monster: Inflict damage to your opponent equal to that opponent's monster's ATK, also destroy that monster.