Blackwing - Sirocco the Dawn
Ⓢ If only your opponent controls a monster, you can Normal Summon/Set this card without Tributing.
① Once per turn: You can target 1 "Blackwing" monster you control; this turn, it gains ATK equal to the total ATK of all "Blackwing" monsters on the field.
(You can't attack the turn you activate this effect, except with that target).
● The target gains ATK equal to the ATK of all Blackwings on the field - including your opponent's.
● If the target is set, and then flipped face-up, it doesn't gain any ATK, and you cannot attack with it.