Is Secrets of the Key legal in Standard, Modern, and Commander?

Secrets of the Key is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Secrets of the Key

Q: What type of card is Secrets of the Key?

Secrets of the Key is an Instant. Its oracle text reads: "Investigate. If this spell was cast from a graveyard, investigate twice instead. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") Flashback {3}{U}"

Instant

Investigate. If this spell was cast from a graveyard, investigate twice instead. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")