Cheapest priced copy (Double Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Painsmith 
Creature — Human Artificer · 2/1 · Uncommon · Scars of Mirrodin · #74
Whenever you cast an artifact spell, you may have target creature get +2/+0 and gain deathtouch until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 102 | Uncommon | $0.35 | $0.49 |
| Scars of Mirrodin | 74 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 7 August 2020An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.