Raffine's Silencer is a uncommon Creature — Human Assassin card from Streets of New Capenna (SNC), collector number 90. Current market price: $0.21 (foil $0.23), TCGplayer market prices via Scryfall.
When this creature enters, it connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.) When this creature dies, target creature an opponent controls gets -X/-X until end of turn, where X is this creature's power.