Is Chrome Companion legal in Standard, Modern, and Commander?

Chrome Companion is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Chrome Companion?

Chrome Companion is an Artifact Creature — Dog. Its oracle text reads: "Whenever this creature becomes tapped, you gain 1 life. {2}, {T}: Put target card from a graveyard on the bottom of its owner's library. *Liberation Station's morale greatly improved after Rover took up residence.* Power/Toughness: 2/1"