Cheapest priced copy (Revised Edition): $0.79 at Card Kingdom, near mint, their price list as of .
Magnetic Mountain 
Enchantment · Uncommon · Arabian Nights · #41
Blue creatures don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player may choose any number of tapped blue creatures they control and pay {4} for each creature chosen this way. If the player does, untap those creatures.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
6 printings · $0.79 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Revised Edition | 163 | Rare | $0.79 | — |
| Fourth Edition Foreign Black Border | 209 | Rare | — | — |
| Fourth Edition | 209 | Rare | $0.99 | — |
| Arabian Nights | 41 | Uncommon | $11.99 | — |
| Foreign Black Border | 163 | Rare | — | — |
| Summer Magic / Edgar | 163 | Rare | — | — |