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 - £14.30
Lightly Played - £12.20
Moderately Played - £10.00
Heavily Played - £7.20
Damaged - £4.30
Near Mint Non English - £14.30
Lightly Played Non English - £12.20
Moderately Played Non English - £10.00
Heavily Played Non English - £7.20
Damaged Non English - £4.30