Cheapest priced copy (Battle Royale Box Set): $0.35 at Card Kingdom, near mint, their price list as of .
Shower of Sparks 
Instant · Common · Duel Decks: Heroes vs. Monsters · #61
Shower of Sparks deals 1 damage to target creature and 1 damage to target player or planeswalker.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
3 printings · $0.35 to $0.39 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battle Royale Box Set | 71 | Common | $0.35 | — |
| Duel Decks: Heroes vs. Monsters | 61 | Common | $0.39 | — |
| Urza's Saga | 217 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 4 October 2004If the creature leaves the battlefield before this resolves, it still damages the player.