Cheapest priced copy (Aether Revolt): $0.35 at Card Kingdom, near mint, their price list as of .
Welder Automaton 
Artifact Creature — Construct · 2/1 · Common · Game Night · #58
{3}{R}: This creature deals 1 damage to each opponent.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Aether Revolt | 183 | Common | $0.35 | $0.49 |
| Game Night | 58 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 9 February 2017In a Two-Headed Giant game, Welder Automaton's ability causes 2 damage total to be dealt to the opposing team.