During your opponent's Main Phase, if "Myutant Evolution Lab" is in your Field Zone (Quick Effect): You can Special Summon this card from your hand. If this card is Special Summoned during your opponent's turn: You can Tribute this card, then banish 1 card from your hand or face-up field; Special Summon 1 of your Level 8 "Myutant" monsters that is banished or in your GY. You can only use each effect of "Myutant GB-88" once per turn.