Contamination [Urza's Saga] UPR008 {T}: Add two mana in

{T}: Add two mana in any combination of colors

or whatever extensive research you've done and can show that they're from that plane

Set: Black & White: Base Set Type: Water Rarity: Promo Retreat cost: Colorless

Set: Dissension Type: Land — Swamp Mountain Rarity: Rare ({T}: Add {B} or {R}

Set: Introductory Two-Player Set Type: Enchantment — Aura Rarity: Uncommon Cost: {2}{B}{B} Enchant land

Contamination [Urza's Saga] UPR008 {T}: Add two mana inSet: Urza's Saga Type: Enchantment Rarity: Rare Cost: {2}{B} 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.