Target 1 Dragon monster you control; its current ATK becomes doubled (until the end of this turn), then, if your opponent controls a Dragon monster, the activation of the targeted monster's effects cannot be negated this turn. During your Main Phase: You can banish this card from your GY; Special Summon 1 of your Dragon Xyz Monsters that is banished or in your GY, in Defense Position. You can only use 1 "Dragon King's Myth" effect per turn, and only once that turn.