Nightmare Magician

[ Illusion / Effect ] If this card battles a monster, neither can be destroyed by that battle. At the end of the Damage Step, if this card battled an opponent's monster: You can take control of that opponent's monster. Once per turn, at the start of the Damage Step, if another monster attacks: You can destroy 1 card on the field. ATK/ 2500 DEF/ 2000