Anointed Peacekeeper is a rare Creature — Human Cleric card from Dominaria United (DMU), collector number 383. Current market price: $0.54 (foil $0.69), TCGplayer market prices via Scryfall.
Vigilance As this creature enters, look at an opponent's hand, then choose any card name. Spells your opponents cast with the chosen name cost {2} more to cast. Activated abilities of sources with the chosen name cost {2} more to activate unless they're mana abilities.