Is Mystical Teachings legal in Standard, Modern, and Commander?

Mystical Teachings is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Mystical Teachings

Q: What type of card is Mystical Teachings?

Mystical Teachings is an Instant. Its oracle text reads: "Search your library for an instant card or a card with flash, reveal it, put it into your hand, then shuffle. Flashback {5}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)"