If you control no other monsters: You can Tribute this card; Special Summon 2 Time Thief monsters with different names from your Deck in Defense Position, except Time Thief Regulator . When an Xyz Monster you control is destroyed by battle, while this card is in your GY: You can Special Summon this card, but banish it when it leaves the field. You can only use each effect of Time Thief Regulator once per turn.