Is Hemlock Vial legal in Standard, Modern, and Commander?

Hemlock Vial is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Hemlock Vial?

Hemlock Vial is an Artifact. Its oracle text reads: "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. *Just what the doctor ordered.*"