Cheapest priced copy (Avacyn Restored): $0.35 at Card Kingdom, near mint, their price list as of .
Cursebreak 
Instant · Common · Avacyn Restored · #14
Destroy target enchantment. You gain 2 life.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 14 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 May 2012If the enchantment is an illegal target when Cursebreak tries to resolve, it’ll be countered and none of its effects will happen. You won’t gain 2 life.