Cheapest priced copy (Duel Decks: Merfolk vs. Goblins): $0.35 at Card Kingdom, near mint, their price list as of .
Cleaver Riot 
Sorcery · Uncommon · Magic 2013 · #125
Creatures you control gain double strike until end of turn. (They deal both first-strike and regular combat damage.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Merfolk vs. Goblins | 36 | Uncommon | $0.35 | — |
| Magic 2013 | 125 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 July 2012Cleaver Riot affects only creatures you control at the time it resolves. It won’t affect creatures that come under your control later in the turn.