Nev, the Practical Dean is a rare Legendary Creature — Merfolk Wizard card from Secrets of Strixhaven Commander (SOC), collector number 89. Current market price: $0.35, TCGplayer market prices via Scryfall.
Creatures you control with counters on them have trample. Whenever you cast your first spell with {X} in its mana cost each turn, put X +1/+1 counters on Nev.