Cheapest priced copy (Commander Legends): $0.35 at Card Kingdom, near mint, their price list as of .
Welding Sparks 
Instant · Common · Duel Decks: Elves vs. Inventors · #49
Welding Sparks deals X damage to target creature, where X is 3 plus the number of artifacts you control.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 210 | Common | $0.35 | $0.49 |
| Duel Decks: Elves vs. Inventors | 49 | Common | $0.35 | — |
| Jumpstart 2022 | 623 | Common | $0.35 | — |
| Kaladesh | 140 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 10 November 2020The number of artifacts you control is counted only as Welding Sparks resolves.
- 10 November 2020If you control zero artifacts, Welding Sparks deals 3 damage to the target creature.