Leafkin Avenger is a uncommon Creature — Elemental Druid card from Core Set 2021 (M21), collector number 220. Current market price: $0.26 (foil $0.56), TCGplayer market prices via Scryfall.
{T}: Add {G} for each creature with power 4 or greater you control. {7}{R}: This creature deals damage equal to its power to target player or planeswalker.