Is Dwarven Hammer legal in Standard, Modern, and Commander?

Dwarven Hammer is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Dwarven Hammer?

Dwarven Hammer is an Artifact — Equipment. Its oracle text reads: "When this Equipment enters, you may pay {2}. If you do, create a 2/1 red Dwarf Berserker creature token, then attach this Equipment to it. Equipped creature gets +3/+0 and has trample. Equip {3}"