Neither player can Special Summon 2 or more monsters at the same time. Once per turn, during either player s turn, when an effect of a card in the Graveyard is activated: You can negate the activation. During either player s turn: You can Tribute this Synchro Summoned card; Special Summon 1 LIGHT Dragon Synchro Monster from your Extra Deck in Defense Position, except Blue-Eyes Spirit Dragon , but destroy it during the End Phase of this turn.