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 - £3.10
Lightly Played - £2.70
Moderately Played - £2.20
Heavily Played - £1.60
Damaged - £1.00
Near Mint Non English - £3.10
Lightly Played Non English - £2.70
Moderately Played Non English - £2.20
Heavily Played Non English - £1.60
Damaged Non English - £1.00