Is Excavation Explosion legal in Standard, Modern, and Commander?

Excavation Explosion is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

What type of card is Excavation Explosion?

Excavation Explosion is a Sorcery. Its oracle text reads: "Excavation Explosion deals 3 damage to any target. Create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") *Urza's engineers could take weeks to dig out a powerstone. The goblins weren't so painstaking.*"

Excavation Explosion

Sorcery

Excavation Explosion deals 3 damage to any target. Create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")