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 - £11.80
Lightly Played - £10.00
Moderately Played - £8.30
Heavily Played - £5.90
Damaged - £3.60
Near Mint Non English - £11.80
Lightly Played Non English - £10.00
Moderately Played Non English - £8.30
Heavily Played Non English - £5.90
Damaged Non English - £3.60