Is Twin Blades legal in Standard, Modern, and Commander?

Twin Blades is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Twin Blades

Q: What type of card is Twin Blades?

Twin Blades is an Artifact — Equipment. Its oracle text reads: "Flash When this Equipment enters, attach it to target creature you control. That creature gains double strike until end of turn. Equipped creature gets +1/+1. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)"