Is Rakdos Keyrune legal in Standard, Modern, and Commander?

Rakdos Keyrune is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Rakdos Keyrune

Q: What type of card is Rakdos Keyrune?

Rakdos Keyrune is an Artifact. Its oracle text reads: "{T}: Add {B} or {R}. {B}{R}: This artifact becomes a 3/1 black and red Devil artifact creature with first strike until end of turn. *The Rakdos use it for everything you can think of and plenty more than that.*"