Cheapest priced copy (Core Set 2020): $0.35 at Card Kingdom, near mint, their price list as of .
Undead Servant 
Creature — Zombie · 3/2 · Common · Core Set 2020 · #118
When this creature enters, create a 2/2 black Zombie creature token for each card named Undead Servant in your graveyard.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2020 | 118 | Common | $0.35 | $0.49 |
| Magic Origins | 124 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 12 July 2019Count the number of Undead Servants in your graveyard as the ability resolves to determine how many tokens to put onto the battlefield. If Undead Servant dies in response to its own triggered ability and is in your graveyard as that ability resolves, it will count toward the number of Zombies you get.