Serpentine Curve is a common Sorcery card from Strixhaven: School of Mages (STX), collector number 52. Current market price: $0.13 (foil $0.13), TCGplayer market prices via Scryfall.
Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is one plus the total number of instant and sorcery cards you own in exile and in your graveyard.