Neither player can Special Summon 2 or more monsters at the same time. Once per turn, when an effect of a card in the GY is activated (Quick Effect): You can negate the activation. (Quick Effect): 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.
