Dueling Coach is a uncommon Creature — Human Monk card from Strixhaven: School of Mages (STX), collector number 15. Current market price: $0.10 (foil $0.09), TCGplayer market prices via Scryfall.
When this creature enters, put a +1/+1 counter on target creature. {4}{W}, {T}: Put a +1/+1 counter on each creature you control with a +1/+1 counter on it.