Activate only during damage calculation when the ATK of your battling monster is lower than the ATK of your opponent's, and 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 - $0.50
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