Cheapest priced copy (Commander Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Legion Vanguard 
Creature — Vampire Soldier · 2/2 · Common · Commander Masters · #170
{1}, Sacrifice another creature: This creature explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 170 | Common | $0.35 | $0.49 |
| Modern Horizons 2 | 90 | Uncommon | $0.35 | $0.49 |