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

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

What type of card is Omen of the Dead?

Omen of the Dead is an Enchantment. Its oracle text reads: "Flash When this enchantment enters, return target creature card from your graveyard to your hand. {2}{B}, Sacrifice this enchantment: Scry 2. *"My time will come, when life's frantic striving will fade into the boundless quiet of death."*"