Is Archfiend of Sorrows legal in Standard, Modern, and Commander?

Archfiend of Sorrows is legal in: Modern, Legacy, Vintage, Commander, Historic.

What type of card is Archfiend of Sorrows?

Archfiend of Sorrows is a Creature — Demon. Its oracle text reads: "Flying When this creature enters, creatures your opponents control get -2/-2 until end of turn. Unearth {3}{B}{B} ({3}{B}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)"

Archfiend of Sorrows

Creature — Demon

Flying

When this creature enters, creatures your opponents control get -2/-2 until end of turn.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)