During damage calculation, if your monster battles an opponent's monster with a higher ATK: Pay Life Points equal to the difference in ATK; your monster gains ATK equal to that difference +300, during damage calculation only.
Near Mint / Lightly Played Unlimited - $1.00
Moderately Played Unlimited - $0.50
Heavily Played Unlimited - $0.50
Damaged Unlimited - $0.50
Near Mint / Lightly Played 1st Edition - $0.50
Moderately Played 1st Edition - $0.50
Heavily Played 1st Edition - $0.50
Damaged 1st Edition - $0.50