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 artifact: Draw a card.")
Near Mint Foil - £6.70
Lightly Played Foil - £5.70
Moderately Played Foil - £4.70
Heavily Played Foil - £3.40
Damaged Foil - £2.00
Near Mint Foil Non English - £6.70
Lightly Played Foil Non English - £5.70
Moderately Played Foil Non English - £4.70
Heavily Played Foil Non English - £3.40
Damaged Foil Non English - £2.00