Conversion

Oracle Text

At the beginning of your upkeep, sacrifice Conversion unless you pay WW.

All Mountains are Plains.

Card Rulings

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.

Additional Information