Is Altar of the Pantheon legal in Standard, Modern, and Commander?

Altar of the Pantheon is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Altar of the Pantheon?

Altar of the Pantheon is an Artifact. Its oracle text reads: "Your devotion to each color and each combination of colors is increased by one. {T}: Add one mana of any color. If you control a God, a Demigod, or a legendary enchantment, you gain 1 life."