When a "Blackwing" monster you control attacks or is attacked, you can send this card from your hand to the Graveyard during the Damage Step to have that monsters gain 1400 ATK until the End Phase.
Near Mint Unlimited - $11.90
Lightly Played Unlimited - $9.50
Moderately Played Unlimited - $8.30
Heavily Played Unlimited - $7.20
Damaged Unlimited - $6.00