Is Dimir Locket legal in Standard, Modern, and Commander?

Dimir Locket is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Dimir Locket

Q: What type of card is Dimir Locket?

Dimir Locket is an Artifact. Its oracle text reads: "{T}: Add {U} or {B}. {U/B}{U/B}{U/B}{U/B}, {T}, Sacrifice this artifact: Draw two cards. *"Wear this, and take your place among the shadows—wise, lethal, and unseen." —Ivrelya, Dimir spymaster*"