Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.
Near Mint - $1.10
Near Mint Non-English - $1.10
Lightly Played - $1.00
Lightly Played Non-English - $1.00
Played - $0.80
Played Non-English - $0.80
Heavily Played - $0.70
Heavily Played Non-English - $0.70
Damaged - $0.60
Damaged Non-English - $0.60