During the Main Phase, if you have a Reptile monster in your GY (Quick Effect): You can send this card from your hand to the GY, then target 1 face-up monster your opponent controls; change its ATK to 0. If your opponent controls a monster with 0 ATK: You can Special Summon this card from your GY. You can only use 1 "Reptilianne Nyami" effect per turn, and only once that turn.
