Cheapest priced copy (Scourge): $1.49 at Card Kingdom, near mint, their price list as of .
Upwelling 
Enchantment · Rare · Tenth Edition · #306
Players don't lose unspent mana as steps and phases end.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $1.49 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 306 | Rare | $2.29 | — |
| Tenth Edition | 306★ | Rare | — | $7.99 |
| Scourge | 131 | Rare | $1.49 | $9.99 |
One ruling from Wizards of the Coast
- 1 October 2009Players can keep unspent mana indefinitely while this is on the battlefield, but once it leaves the battlefield, they have until the end of the current step (or phase) to use the mana before it disappears.