Cheapest priced copy (Warhammer 40,000 Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Space Marine Scout 
Creature — Astartes Scout · 2/1 · Uncommon · Warhammer 40,000 Commander · #15
First strike, vigilance
Concealed Position — When this creature enters, if an opponent controls more lands than you, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Warhammer 40,000 Commander | 15 | Uncommon | $0.99 | — |
| Warhammer 40,000 Commander | 15★ | Uncommon | — | — |
One ruling from Wizards of the Coast
- 7 October 2022Space Marine Scout's triggered ability has an "intervening if clause," which means that it checks to see whether or not an opponent controls more lands than you both when it triggers and when it resolves. If it isn't true both times, you won't search your library for a Plains card.