Cheapest priced copy (Shadows over Innistrad): $0.49 at Card Kingdom, near mint, their price list as of .
Burn from Within 
Sorcery · Rare · Shadows over Innistrad · #148
Burn from Within deals X damage to any target. If a creature is dealt damage this way, it loses indestructible until end of turn. If that creature would die this turn, exile it instead.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $2.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadows over Innistrad Promos | 148s | Rare | — | $2.79 |
| Shadows over Innistrad | 148 | Rare | $0.49 | $0.99Out of stock |
3 rulings from Wizards of the Coast
- 8 April 2016If Burn from Within doesn’t deal damage to the target creature (perhaps because that damage was prevented or X is 0), neither additional effect will apply. It won’t lose indestructible, and it won’t be exiled instead of dying that turn.
- 8 April 2016You can target a creature that doesn’t have indestructible with Burn from Within. It will still be exiled if it would die this turn.
- 8 April 2016The damaged creature will be exiled if it would die for any reason that turn, not just if it dies due to damage from Burn from Within.