Cheapest priced copy (Coldsnap Theme Decks): $0.35 at Card Kingdom, near mint, their price list as of .
Essence Flare 
Enchantment — Aura · Common · Ice Age · #69
Enchant creature
Enchanted creature gets +2/+0.
At the beginning of the upkeep of enchanted creature's controller, put a -0/-1 counter on that creature.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Coldsnap Theme Decks | 69 | Common | $0.35 | — |
| Ice Age | 69 | Common | $0.49 | — |
One ruling from Wizards of the Coast
- 1 October 2008The -0/-1 counters stay on the creature even if Essence Flare is removed.