Is North Star legal in Standard, Modern, and Commander?

North Star is legal in: Legacy, Vintage, Commander.

North Star

Q: What type of card is North Star?

North Star is an Artifact. Its oracle text reads: "{4}, {T}: For one spell this turn, you may spend mana as though it were mana of any type to pay that spell's mana cost. (Additional costs are still paid normally.)"

Artifact

, : For one spell this turn, you may spend mana as though it were mana of any type to pay that spell's mana cost. (Additional costs are still paid normally.)