Cheapest priced copy (Commander Masters): $0.49 at Card Kingdom, near mint, their price list as of .
Loyal Subordinate 
Creature — Zombie · 3/1 · Uncommon · The List · #SCD-90
Menace (This creature can't be blocked except by two or more creatures.)
Lieutenant — At the beginning of combat on your turn, if you control your commander, each opponent loses 3 life.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2018 | 16 | Uncommon | $0.79 | — |
| Commander Masters | 172 | Uncommon | $0.49 | $1.49 |
| The List | SCD-90 | Uncommon | — | — |
| Starter Commander Decks | 90 | Uncommon | $0.59 | — |
3 rulings from Wizards of the Coast
- 13 July 2018The lieutenant effect happens only once each combat, even if you somehow control multiple commanders (perhaps because you have two commanders with a partner ability from the Battlebond™ set).
- 13 July 2018If you have multiple commanders, you need to control only one for the lieutenant effect to happen.
- 13 July 2018If you don’t control your commander as the lieutenant ability resolves, you won’t get its effect.