Cheapest priced copy (Ultimate Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Myr Servitor 
Artifact Creature — Myr · 1/1 · Common · Fifth Dawn · #139
At the beginning of your upkeep, if this creature is on the battlefield, each player returns all cards named Myr Servitor from their graveyard to the battlefield.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fifth Dawn | 139 | Common | $0.39 | $1.99 |
| Ultimate Masters | 230 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 7 December 2018The Myr Servitor that's the source of the triggered ability must still be on the battlefield when the ability resolves. If it is, all other Myr Servitor cards are returned from all graveyards to the battlefield under their owner's control. If it's not, no Myr Servitors are returned to the battlefield.