Is Forbidden Alchemy legal in Standard, Modern, and Commander?

Forbidden Alchemy is legal in: Modern, Legacy, Vintage, Commander, Pauper, Historic.

Forbidden Alchemy

Q: What type of card is Forbidden Alchemy?

Forbidden Alchemy is an Instant. Its oracle text reads: "Look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard. Flashback {6}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)"