Wildgrowth Archaic is a rare Creature — Avatar card from Secrets of Strixhaven Promos (PSOS), collector number 168p. Current market price: $0.69 (foil $1.32), TCGplayer market prices via Scryfall.
Reach, trample Converge — This creature enters with a +1/+1 counter on it for each color of mana spent to cast it. Whenever you cast a creature spell, that creature enters with X additional +1/+1 counters on it, where X is the number of colors of mana spent to cast it.