Is Dromoka Monument legal in Standard, Modern, and Commander?

Dromoka Monument is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Dromoka Monument

Q: What type of card is Dromoka Monument?

Dromoka Monument is an Artifact. Its oracle text reads: "{T}: Add {G} or {W}. {4}{G}{W}: This artifact becomes a 4/4 green and white Dragon artifact creature with flying until end of turn. *Dromoka rules her clan from the Great Aerie atop Arashin, the central city of the Shifting Wastes.*"