Vizier of the True is a uncommon Creature — Human Cleric card from Hour of Devastation (HOU), collector number 28. Current market price: $0.03 (foil $0.20), TCGplayer market prices via Scryfall.
You may exert this creature as it attacks. (It won't untap during your next untap step.) Whenever you exert a creature, tap target creature an opponent controls.