Cheapest priced copy (The Brothers' War): $0.35 at Card Kingdom, near mint, their price list as of .
Mine Worker 
Artifact Creature — Assembly-Worker · 2/1 · Common · The Brothers' War · #239
{T}: You gain 1 life. If you control creatures named Power Plant Worker and Tower Worker, you gain 3 life instead.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War | 239 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 14 October 2022You will gain 3 life instead of 1 if, at the time the ability resolves, you control at least one creature named Power Plant Worker and at least one creature named Tower Worker.