Duskfang Mentor is a uncommon Creature — Human Cleric card from Ikoria: Lair of Behemoths (IKO), collector number 86. Current market price: $0.18 (foil $0.44), TCGplayer market prices via Scryfall.
When this creature enters, put a lifelink counter on target non-Human creature you control. {1}{B}, {T}: Put a +1/+1 counter on each creature you control with lifelink.