During either player's Damage Step, when a "Blackwing" monster you control is attacking or being attacked: You can send this card from your hand to the Graveyard; that monster gains 1400 ATK until the End Phase.
Near Mint Unlimited - $27.00
Lightly Played Unlimited - $24.20
Moderately Played Unlimited - $21.50
Heavily Played Unlimited - $18.30
Damaged Unlimited - $10.90