Monsters your opponent controls lose 300 ATK DEF. You can only use each of the following effects of Urubonus, the Avatar of Malice once per turn. You can Tribute 1 Reptile monster; Special Summon this card from your hand. You can Tribute 1 monster; all monsters your opponent currently controls lose ATK DEF equal to the original ATK of the Tributed monster, until the end of this turn.