Is Vorpal Sword legal in Standard, Modern, and Commander?

Vorpal Sword is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Vorpal Sword?

Vorpal Sword is an Artifact — Equipment. Its oracle text reads: "Equipped creature gets +2/+0 and has deathtouch. {5}{B}{B}{B}: Until end of turn, this Equipment gains "Whenever equipped creature deals combat damage to a player, that player loses the game." Equip {B}{B}"