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

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

The Seventh Doctor

Q: What type of card is The Seventh Doctor?

The Seventh Doctor is a Legendary Creature — Time Lord Doctor. Its oracle text reads: "Whenever The Seventh Doctor attacks, choose a card in your hand. Defending player guesses whether that card's mana value is greater than the number of artifacts you control. If they guessed wrong, you may cast it without paying its mana cost. If you don't cast a spell this way, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") Power/Toughness: 3/6"

Legendary Creature — Time Lord Doctor

Whenever The Seventh Doctor attacks, choose a card in your hand. Defending player guesses whether that card's mana value is greater than the number of artifacts you control. If they guessed wrong, you may cast it without paying its mana cost. If you don't cast a spell this way, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")