Silverquill Silencer is a rare Creature — Human Cleric card from Strixhaven: School of Mages Promos (PSTX), collector number 234s. Current market price: — (foil $0.37), TCGplayer market prices via Scryfall.
As this creature enters, choose a nonland card name. Whenever an opponent casts a spell with the chosen name, they lose 3 life and you draw a card.