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 - $14.40
Near Mint Non-English - $14.40
Lightly Played - $13.00
Lightly Played Non-English - $13.00
Played - $10.10
Played Non-English - $10.10
Heavily Played - $8.70
Heavily Played Non-English - $8.70
Damaged - $7.20
Damaged Non-English - $7.20