Cheapest priced copy (Magic 2015): $0.35 at Card Kingdom, near mint, their price list as of .
Blastfire Bolt 
Instant · Common · Magic 2015 · #130
Blastfire Bolt deals 5 damage to target creature. Destroy all Equipment attached to that creature.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2015 | 130 | Common | $0.35 | $0.49 |
| The List | M15-130 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 18 July 2014Blastfire Bolt can target any creature, not just one with Equipment attached to it. The damage will be dealt to the creature even if it doesn’t have any Equipment attached to it.
- 18 July 2014If the target creature is an illegal target when Blastfire Bolt tries to resolve, it won’t resolve and none of its effects will happen. No Equipment will be destroyed.