Conclave Mentor is a uncommon Creature — Centaur Cleric card from Double Masters 2022 (2X2), collector number 195. Current market price: $0.36 (foil $1.80), TCGplayer market prices via Scryfall.
If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on that creature instead. When this creature dies, you gain life equal to its power.