Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Sejiri Merfolk 
Creature — Merfolk Soldier · 2/1 · Uncommon · Worldwake · #36
As long as you control a Plains, this creature has first strike and lifelink. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper