Cheapest priced copy (Conspiracy: Take the Crown): $0.35 at Card Kingdom, near mint, their price list as of .
Public Execution 
Instant · Uncommon · Magic 2013 · #105
Destroy target creature an opponent controls. Each other creature that player controls gets -2/-0 until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy: Take the Crown | 145 | Uncommon | $0.35 | $0.49 |
| Magic 2013 | 105 | Uncommon | $0.35 | $0.49 |
| The List | M13-105 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 1 July 2012Public Execution targets only the creature it destroys. If that creature is an illegal target when Public Execution tries to resolve, it won't resolve and none of its effects will happen. No creature will get -2/-0.
- 1 July 2012Only creatures controlled by the player when Public Execution resolves will get -2/-0. Creatures that enter under that player's control or that the player gains control of later in the turn are unaffected.
- 1 July 2013If the target creature regenerates or has indestructible, each other creature controlled by that creature's controller will still get -2/-0.