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 - $4.20
Near Mint Non-English - $4.20
Lightly Played - $3.80
Lightly Played Non-English - $3.80
Played - $3.00
Played Non-English - $3.00
Heavily Played - $2.60
Heavily Played Non-English - $2.60
Damaged - $2.10
Damaged Non-English - $2.10