You can send 1 "Regenesis" monster from your Deck to the GY, then target 1 face-up monster your opponent controls; change it to face-down Defense Position. During your opponent's turn: You can send this card to the GY; Special Summon as many "Regenesis" monsters as possible with different names from your hand, GY, and/or banishment, but send them to the GY during the End Phase. You can only use 1 "Regenesis Birth" effect per turn, and only once that turn.