Is The Fugitive Doctor legal in Standard, Modern, and Commander?

The Fugitive Doctor is legal in: Legacy, Vintage, Commander.

The Fugitive Doctor

Q: What type of card is The Fugitive Doctor?

The Fugitive Doctor is a Legendary Creature — Time Lord Doctor. Its oracle text reads: "When The Fugitive Doctor enters, investigate. Whenever The Fugitive Doctor attacks, you may sacrifice a Clue. When you do, target instant or sorcery card in your graveyard gains flashback {2}{R}{G} until end of turn. (You may cast that card from your graveyard for its flashback cost. Then exile it.)"

Legendary Creature — Time Lord Doctor

When The Fugitive Doctor enters, investigate.

Whenever The Fugitive Doctor attacks, you may sacrifice a Clue. When you do, target instant or sorcery card in your graveyard gains flashback until end of turn. (You may cast that card from your graveyard for its flashback cost. Then exile it.)