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 - $18.30
Lightly Played Unlimited - $16.50
Moderately Played Unlimited - $14.60
Heavily Played Unlimited - $11.10
Damaged Unlimited - $7.40