Cheapest priced copy (Commander 2011): $0.35 at Card Kingdom, near mint, their price list as of .
Lash Out 
Instant · Common · Lorwyn · #183
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.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2011 | 127 | Common | $0.35 | — |
| Lorwyn | 183 | Common | $0.35 | $0.49 |
| The List | LRW-183 | Common | $0.35 | — |