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 - $10.10
Lightly Played Unlimited - $9.10
Moderately Played Unlimited - $7.10
Heavily Played Unlimited - $5.10
Damaged Unlimited - $4.10