At the beginning of your upkeep, sacrifice Contamination unless you sacrifice a creature. If a land is tapped for mana, it produces {B} instead of any other type and amount.
Near Mint - £10.00
Lightly Played - £8.50
Moderately Played - £7.00
Heavily Played - £5.00
Damaged - £3.00
Near Mint Non English - £10.00
Lightly Played Non English - £8.50
Moderately Played Non English - £7.00
Heavily Played Non English - £5.00
Damaged Non English - £3.00