Cheapest priced copy (Revised Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Conversion 
Enchantment · Uncommon · 30th Anniversary Edition · #16
At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}.
All Mountains are Plains.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
12 printings · $0.35 to $94.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Unlimited Edition | 16 | Uncommon | $1.79Out of stock | — |
| 30th Anniversary Edition | 16 | Uncommon | $0.99 | — |
| 30th Anniversary Edition | 313 | Uncommon | $94.99 | — |
| Revised Edition | 14 | Uncommon | $0.35 | — |
| Fourth Edition Foreign Black Border | 19 | Uncommon | — | — |
| Fourth Edition | 19 | Uncommon | $0.35 | — |
| Collectors' Edition | 16 | Uncommon | $0.99 | — |
| Intl. Collectors' Edition | 16 | Uncommon | $0.99 | — |
| Foreign Black Border | 14 | Uncommon | — | — |
| Limited Edition Alpha | 15 | Uncommon | $47.99 | — |
| Limited Edition Beta | 16 | Uncommon | $13.99 | — |
| Summer Magic / Edgar | 14 | Uncommon | — | — |
2 rulings from Wizards of the Coast
- 4 October 2004The Conversion effect is a continuous effect. There is no chance to tap a just-played mountain for red mana before it becomes a plains.
- 15 October 2006Will not add or remove the supertype snow to or from a land.