Cheapest priced copy (Avacyn Restored): $0.35 at Card Kingdom, near mint, their price list as of .
Defang 
Enchantment — Aura · Common · Avacyn Restored · #15
Enchant creature
Prevent all damage that would be dealt by enchanted creature.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 15 | Common | $0.35 | $0.49 |