Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Burn Away 
Instant · Uncommon · Khans of Tarkir · #104
Burn Away deals 6 damage to target creature. When that creature dies this turn, exile its controller's graveyard.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy: Take the Crown | 151 | Uncommon | $0.39 | $0.49 |
| Khans of Tarkir | 104 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 20 September 2014If the creature doesn’t die that turn, the delayed triggered ability will simply cease to exist. It won’t trigger on a future turn.