Cheapest priced copy (Lorwyn): $0.49 at Card Kingdom, near mint, their price list as of .
Spring Cleaning 
Instant · Common · Lorwyn · #236
Destroy target enchantment. Clash with an opponent. If you win, destroy all enchantments your opponents control. (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
1 printing · $0.49 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Lorwyn | 236 | Common | $0.49 | $3.49Out of stock |
2 rulings from Wizards of the Coast
- 1 October 2007If you win the clash, you destroy all enchantments all of your opponents control, not just enchantments controlled by the opponent you clashed with.
- 20 September 2013If you win the clash and the targeted enchantment is controlled by an opponent, it will be destroyed a second time if it's still on the battlefield (for instance, if it somehow regenerated).