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 - £10.10
Lightly Played - £8.60
Moderately Played - £7.10
Heavily Played - £5.10
Damaged - £3.10
Near Mint Non English - £10.10
Lightly Played Non English - £8.60
Moderately Played Non English - £7.10
Heavily Played Non English - £5.10
Damaged Non English - £3.10