Is Quintessential Katana legal in Standard, Modern, and Commander?

Quintessential Katana is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Quintessential Katana

Q: What type of card is Quintessential Katana?

Quintessential Katana is an Artifact — Equipment. Its oracle text reads: "Equipped creature gets +1/+1 and has "Whenever this creature deals combat damage, untap it and you gain 2 life." Whenever a Ninja you control enters, you may attach this Equipment to it. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)"