Is Sleep of the Dead legal in Standard, Modern, and Commander?

Sleep of the Dead is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Sleep of the Dead?

Sleep of the Dead is a Sorcery. Its oracle text reads: "Tap target creature. It doesn't untap during its controller's next untap step. Escape—{2}{U}, Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)"