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 - $28.60
Lightly Played Unlimited - $25.70
Moderately Played Unlimited - $22.90
Heavily Played Unlimited - $17.20
Damaged Unlimited - $14.30