Contamination

Enchantment    (CMC:3)

During your upkeep, sacrifice a creature or sacrifice Contamination. Whenever a land is tapped for mana, it produces instead of its normal type and amount.

123 UZ • ENStephen Daniele

™ & © 1993—1998 Wizards of the Coast

Legal in: Urza Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Contamination {2}{B} Enchantment 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.

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View this MTG card on Gatherer

10/4/2004
The second ability of this card is a replacement effect, not a triggered ability.
10/4/2004
External effects that generate more mana still generate their additional mana as directed without being affected by this card. Effects which generate more mana based on what type of mana the land produces will be affected in color but not in amount.
10/4/2004
You choose whether to sacrifice a creature or not on resolution. If not, then you sacrifice Contamination. You can choose to not sacrifice even if you no longer control Contamination on resolution.

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Card Contamination is not on TCGPlayer.