When a monster(s) would be Summoned, OR a Spell/Trap Card is activated: Pay half your LP; negate the Summon or activation, and if you do, destroy that card.
Near Mint / Lightly Played Unlimited - $7.50
Moderately Played Unlimited - $7.00
Heavily Played Unlimited - $5.50
Damaged Unlimited - $4.50
Near Mint / Lightly Played 1st Edition - $6.50
Moderately Played 1st Edition - $5.50
Heavily Played 1st Edition - $5.00
Damaged 1st Edition - $4.00