Cheapest priced copy (Commander 2020): $0.99 at Card Kingdom, near mint, their price list as of .
Thalia's Lieutenant 
Creature — Human Soldier · 1/1 · Rare · The List · #SOI-43
When this creature enters, put a +1/+1 counter on each other Human you control.
Whenever another Human you control enters, put a +1/+1 counter on this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.99 to $9.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 103 | Rare | $0.99 | — |
| The List | SOI-43 | Rare | $1.29 | — |
| Shadows over Innistrad Promos | 43s | Rare | — | $9.49 |
| Shadows over Innistrad | 43 | Rare | $1.29 | $4.99 |
One ruling from Wizards of the Coast
- 8 April 2016If Thalia’s Lieutenant enters the battlefield at the same time as another Human, each of Thalia’s Lieutenant’s abilities will trigger. You’ll put a +1/+1 counter on both cards.