Cheapest priced copy (The Lost Caverns of Ixalan Commander): $0.69 at Card Kingdom, near mint, their price list as of .
Legion Lieutenant 
Creature — Vampire Knight · 2/2 · Uncommon · Rivals of Ixalan · #163
Other Vampires you control get +1/+1.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.69 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan Commander | 275 | Uncommon | $0.69 | — |
| Rivals of Ixalan | 163 | Uncommon | $0.69 | $5.99 |
One ruling from Wizards of the Coast
- 19 January 2018Because damage remains marked on a creature until it's removed as the turn ends, nonlethal damage dealt to another Vampire you control may become lethal if Legion Lieutenant leaves the battlefield during that turn.