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 - $26.90
Lightly Played Unlimited - $25.60
Moderately Played Unlimited - $22.90
Heavily Played Unlimited - $20.20
Damaged Unlimited - $18.80