Blackwing - Sirocco the Dawn (Purple) (DL17-EN007) [Duelist League Promo]

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