Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Encampment Keeper 
Creature — Dog · 1/1 · Common · Ixalan · #11
First strike
{7}{W}, {T}, Sacrifice this creature: Creatures you control get +2/+2 until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard