Harsh Mentor is a rare Creature — Human Cleric card from Amonkhet Promos (PAKH), collector number 135s. Current market price: — (foil $8.98), TCGplayer market prices via Scryfall.
Whenever an opponent activates an ability of an artifact, creature, or land on the battlefield, if it isn't a mana ability, this creature deals 2 damage to that player.