Is Slagstone Refinery legal in Standard, Modern, and Commander?

Slagstone Refinery is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Slagstone Refinery

Q: What type of card is Slagstone Refinery?

Slagstone Refinery is an Artifact. Its oracle text reads: "Whenever this artifact or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")"

Artifact

Whenever this artifact or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")