Cheapest priced copy (Double Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Defiant Salvager 
Creature — Aetherborn Artificer · 2/2 · Common · Aether Revolt · #56
Sacrifice an artifact or creature: Put a +1/+1 counter on this creature. Activate only as a sorcery.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 83 | Common | $0.35 | $0.49 |
| Aether Revolt | 56 | Common | $0.35 | $0.49 |
| Commander Legends | 117 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 10 November 2020If you sacrifice an artifact creature to activate Defiant Salvager's ability, you put one +1/+1 counter on Defiant Salvager, not two.
- 10 November 2020You can sacrifice Defiant Salvager to activate its own ability. It won't receive a counter, but abilities that trigger on the sacrifice or watch for a creature dying will see it.