Conversion

Enchantment    (CMC:4)

At the beginning of your upkeep, sacrifice Conversion unless you pay . All Mountains are Plains.

9 ME4 • ENJesper Myrfors

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Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

10/4/2004
The Conversion effect is a continuous effect. There is no chance to tap a just-played mountain for red mana before it becomes a plains.
10/15/2006
Will not add or remove Snow Supertype to or from a land.