Cheapest priced copy (Dominaria): $0.35 at Card Kingdom, near mint, their price list as of .
Thallid Omnivore 
Creature — Fungus · 3/3 · Common · Dominaria · #106
{1}, Sacrifice another creature: This creature gets +2/+2 until end of turn. If a Saproling was sacrificed this way, you gain 2 life.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard