Emil, Vastlands Roamer is a uncommon Legendary Creature — Elf Druid card from Secrets of Strixhaven (SOS), collector number 146. Current market price: $0.26 (foil $0.30), TCGplayer market prices via Scryfall.
Creatures you control with +1/+1 counters on them have trample. {4}{G}, {T}: Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of differently named lands you control.