Is Proteus Staff legal in Standard, Modern, and Commander?

Proteus Staff is legal in: Modern, Legacy, Vintage, Commander.

Proteus Staff

Q: What type of card is Proteus Staff?

Proteus Staff is an Artifact. Its oracle text reads: "{2}{U}, {T}: Put target creature on the bottom of its owner's library. That creature's controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield and the rest on the bottom of their library in any order. Activate only as a sorcery."

Artifact

, : Put target creature on the bottom of its owner's library. That creature's controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield and the rest on the bottom of their library in any order. Activate only as a sorcery.