Cheapest priced copy (Betrayers of Kamigawa): $0.35 at Card Kingdom, near mint, their price list as of .
Aura Barbs 
Instant — Arcane · Uncommon · The List · #BOK-94
Each enchantment deals 2 damage to its controller, then each Aura attached to a creature deals 2 damage to the creature it's attached to.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Betrayers of Kamigawa | 94 | Uncommon | $0.35 | $0.79 |
| The List | BOK-94 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 1 February 2005The damage is dealt by the enchantments, not by Aura Barbs.