Hemlock Vial is a uncommon Artifact card from Assassin's Creed (ACR), collector number 26. Current market price: $0.16 (foil $0.20), TCGplayer market prices via Scryfall.
When this artifact enters, you draw a card and you lose 1 life. {B}, {T}, Sacrifice this artifact: Each equipped creature and Equipment you control gains deathtouch until end of turn.