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 - £36.00
Lightly Played - £30.60
Moderately Played - £25.20
Heavily Played - £18.00
Damaged - £10.80
Near Mint Non English - £36.00
Lightly Played Non English - £30.60
Moderately Played Non English - £25.20
Heavily Played Non English - £18.00
Damaged Non English - £10.80