Savage Thallid is a common Creature — Fungus card from Time Spiral (TSP), collector number 213. Current market price: $0.41 (foil $8.55), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, put a spore counter on this creature. Remove three spore counters from this creature: Create a 1/1 green Saproling creature token. Sacrifice a Saproling: Regenerate target Fungus.