Cheapest priced copy (Aether Revolt): $0.49 at Card Kingdom, near mint, their price list as of .
Quicksmith Rebel 
Creature — Human Artificer · 3/2 · Rare · Aether Revolt · #93
When this creature enters, target artifact you control gains "{T}: This artifact deals 2 damage to any target" for as long as you control this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aether Revolt | 93 | Rare | $0.49 | $0.49 |
| Aether Revolt Promos | 93 | Rare | — | $0.49 |
| Aether Revolt Promos | 93s | Rare | — | $0.49 |
4 rulings from Wizards of the Coast
- 9 February 2017If Quicksmith Rebel leaves the battlefield while its ability is on the stack, the artifact never gains the damage-dealing ability.
- 9 February 2017If another player gains control of Quicksmith Rebel, the artifact will no longer have the damage-dealing ability, even if you regain control of Quicksmith Rebel.
- 9 February 2017If Quicksmith Rebel leaves the battlefield, you no longer control it.
- 9 February 2017If Quicksmith Rebel or the artifact leaves the battlefield while the damage-dealing ability is on the stack, that ability resolves as normal.