Contamination [Urza's Saga] Magic Player Rewards 2011 You can't choose the same

You can't choose the same card twice

and permanents are the chosen color in addition to their other colors

Spend this mana only to cast artifact spells

then return a creature card put into a graveyard this way to the battlefield under your control

Set: Magic 2012 Type: Creature — Bird Rarity: Rare Cost: {G} Flying

Contamination [Urza's Saga] Magic Player Rewards 2011 You can't choose the sameSet: 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.