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 - £61.40
Lightly Played - £52.20
Moderately Played - £43.00
Heavily Played - £30.70
Damaged - £18.50
Near Mint Non English - £61.40
Lightly Played Non English - £52.20
Moderately Played Non English - £43.00
Heavily Played Non English - £30.70
Damaged Non English - £18.50