Serpentine Curve is a common Sorcery card from The List (PLST), collector number STX-52. Current market price: $0.20, 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.