Lash Out is a common Instant card from Commander 2011 (CMD), collector number 127. Current market price: $0.12, TCGplayer market prices via Scryfall.
Lash Out deals 3 damage to target creature. Clash with an opponent. If you win, Lash Out deals 3 damage to that creature's controller. (Each clashing player reveals the top card of their library, then puts that card on their choice of the top or bottom. A player wins if their card had a greater mana value.)