Meteor Rush - Monochroid - Photon Hypernova (PHHY)

During the Battle Phase, if 5 or more attacks have been declared this turn (Quick Effect): You can Special Summon this card from your hand. You can only use this effect of "Meteor Rush - Monochroid" once per turn. If this card battles, it gains 1000 ATK for each attack declared this turn, during the Damage Step only.