Cheapest priced copy (Foundations Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Contract Killing 
Sorcery · Common · Ixalan · #95
Destroy target creature. Create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 413 | Common | $0.35 | — |
| Ixalan | 95 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 29 September 2017If the target creature is an illegal target by the time Contract Killing resolves, the entire spell doesn't resolve. You won't get Treasures. If, on the other hand, the target is a legal target but isn't destroyed (most likely because it has indestructible), you'll get Treasures.