Is Electric Revelation legal in Standard, Modern, and Commander?

Electric Revelation is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Electric Revelation?

Electric Revelation is an Instant. Its oracle text reads: "As an additional cost to cast this spell, discard a card. Draw two cards. Flashback {3}{R} (You may cast this card from your graveyard for its flashback cost and any additional costs. Then exile it.)"