Aura Barbs is a uncommon Instant — Arcane card from Betrayers of Kamigawa (BOK), collector number 94. Current market price: $0.28 (foil $0.80), TCGplayer market prices via Scryfall.
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.