Thallid Omnivore is a common Creature — Fungus card from Dominaria (DOM), collector number 106. Current market price: $0.21 (foil $0.36), TCGplayer market prices via Scryfall.
{1}, Sacrifice another creature: This creature gets +2/+2 until end of turn. If a Saproling was sacrificed this way, you gain 2 life.