Is Isochron Scepter legal in Standard, Modern, and Commander?

Isochron Scepter is legal in: Modern, Legacy, Vintage, Commander.

Isochron Scepter

Q: What type of card is Isochron Scepter?

Isochron Scepter is an Artifact. Its oracle text reads: "Imprint — When this artifact enters, you may exile an instant card with mana value 2 or less from your hand. {2}, {T}: You may copy the exiled card. If you do, you may cast the copy without paying its mana cost."