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.
NM-Mint - $3.00
Lightly Played - $2.70
Moderately Played - $2.40
Heavily Played - $2.10
Damaged - $1.50
NM-Mint Non English - $3.00
Lightly Played Non English - $2.70
Moderately Played Non English - $2.40
Heavily Played Non English - $2.10
Damaged Non English - $1.50