Thallid Germinator is a common Creature — Fungus card from Time Spiral (TSP), collector number 225. Current market price: $0.20 (foil $0.40), 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: Target creature gets +1/+1 until end of turn.