Exosister Karmael

“2 Level 4 "Exosister" monsters If this card is Xyz Summoned: You can activate this effect; during the End Phase of this turn, Set 1 "Exosister" Spell/Trap from your Deck, GY, or banishment. When your opponent activates a monster effect, or a Normal Spell/Trap Card (Quick Effect): You can detach all materials from this card, and if you do, the activated effect becomes "Add 1 card from your opponent's GY to their hand". You can only use each effect of "Exosister Karmael" once per turn.”