Target 1 "Time Thief" Xyz Monster you control; attach 1 "Time Thief" card from your hand or Deck to it as material. You can banish this card from your GY, then target 1 "Time Thief" Xyz Monster you control; attach 1 card from your opponent's GY to it as material. You can only use 1 "Time Thief Flyback" effect per turn, and only once that turn.