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 - $3.40
Near Mint Non-English - $3.40
Lightly Played - $3.00
Lightly Played Non-English - $3.00
Played - $2.40
Played Non-English - $2.40
Heavily Played - $2.00
Heavily Played Non-English - $2.00
Damaged - $1.70
Damaged Non-English - $1.70