Prismari Apprentice is a uncommon Creature — Human Shaman card from Strixhaven: School of Mages (STX), collector number 213. Current market price: $0.15 (foil $0.21), TCGplayer market prices via Scryfall.
Magecraft — Whenever you cast or copy an instant or sorcery spell, this creature can't be blocked this turn. If that spell has mana value 5 or greater, put a +1/+1 counter on this creature.