Is The Mana Rig legal in Standard, Modern, and Commander?

The Mana Rig is legal in: Legacy, Vintage, Commander.

What type of card is The Mana Rig?

The Mana Rig is a Legendary Artifact. Its oracle text reads: "Whenever you cast a multicolored spell, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") {X}{X}{X}, {T}: Look at the top X cards of your library. Put up to two of them into your hand and the rest on the bottom of your library in a random order."

The Mana Rig

Legendary Artifact

Whenever you cast a multicolored spell, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")