Is Ronin Warclub legal in Standard, Modern, and Commander?

Ronin Warclub is legal in: Modern, Legacy, Vintage, Commander.

Ronin Warclub

Q: What type of card is Ronin Warclub?

Ronin Warclub is an Artifact — Equipment. Its oracle text reads: "Equipped creature gets +2/+1. Whenever a creature you control enters, attach this Equipment to that creature. Equip {5} ({5}: Attach to target creature you control. Equip only as a sorcery.)"