Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Merfolk Seastalkers 
Creature — Merfolk Scout · 2/3 · Uncommon · Zendikar · #55
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{2}{U}: Tap target creature without flying.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper