Magician's Robe

“During your opponent's turn (Quick Effect): You can discard 1 Spell/Trap; Special Summon 1 "Dark Magician" from your Deck. During your opponent's turn, if you activate a Spell/Trap Card or effect while this card is in your GY (except during the Damage Step): You can Special Summon this card, but banish it when it leaves the field. You can only use each effect of "Magician's Robe" once per turn.”