Manifestation Sage is a rare Creature — Human Wizard card from Strixhaven: School of Mages Promos (PSTX), collector number 205p. Current market price: $0.43 (foil $0.38), TCGplayer market prices via Scryfall.
When this creature enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of cards in your hand.