Blackwing - Sirocco the Dawn (Purple) (Rare) - Duelist League Promo Unlimited

If your opponent controls a monster and you control no monsters, you can Normal Summon or Set this card without Tributing. Once per turn, you can select 1 face-up "Blackwing" monster you control. It gains ATK equal to the total ATK of all face-up "Blackwi