Cheapest priced copy (Foundations Jumpstart): $0.49 at Card Kingdom, near mint, their price list as of .
Basri's Lieutenant 
Creature — Human Knight · 3/4 · Rare · Core Set 2021 · #288
Vigilance, protection from multicolored
When this creature enters, put a +1/+1 counter on target creature you control.
Whenever this creature or another creature you control dies, if it had a +1/+1 counter on it, create a 2/2 white Knight creature token with vigilance.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $2.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 171 | Rare | $0.49 | — |
| Core Set 2021 | 9 | Rare | $0.49 | $0.49 |
| Core Set 2021 | 288 | Rare | $0.49 | $0.49 |
| Core Set 2021 Promos | 9p | Rare | $0.59 | $1.49 |
| Core Set 2021 Promos | 9s | Rare | — | $2.29 |
4 rulings from Wizards of the Coast
- 23 June 2020The second triggered ability of Basri's Lieutenant triggers just once if the dying creature has +1/+1 counters on it, no matter how many of those counters it has.
- 23 June 2020If Basri's Lieutenant dies at the same time as other creatures, its last ability will trigger for any of the creatures that had a +1/+1 counter on it, including itself.
- 23 June 2020If a creature with +1/+1 counters on it receives a greater or equal number of -1/-1 counters and this causes it to be destroyed by lethal damage or put into its owner's graveyard for having 0 or less toughness, the last ability triggers. This is because the ability checks the creature as it last existed on the battlefield, and it still had those counters on it at that point.
- 23 June 2020Basri's Lieutenant can be the target of its own enters-the-battlefield triggered ability.