Is Ghostfire Blade legal in Standard, Modern, and Commander?

Ghostfire Blade is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Ghostfire Blade?

Ghostfire Blade is an Artifact — Equipment. Its oracle text reads: "Equipped creature gets +2/+2. Equip {3} This Equipment's equip ability costs {2} less to activate if it targets a colorless creature. *If you fear the dragon's fire, you are unworthy to wield it.*"