Cheapest priced copy (Doctor Who): $0.49 at Card Kingdom, near mint, their price list as of .
The Seventh Doctor 
Legendary Creature — Time Lord Doctor · 3/6 · Rare · Doctor Who · #442
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.")
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
7 printings · $0.49 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Doctor Who | 158 | Rare | $0.49 | $0.49 |
| Doctor Who | 442 | Rare | $0.49 | $0.49 |
| Doctor Who | 558 | Rare | $0.59 | $0.99 |
| Doctor Who | 558z | Rare | — | — |
| Doctor Who | 763 | Rare | — | $0.49 |
| Doctor Who | 1033 | Rare | — | $0.79 |
| Doctor Who | 1149 | Rare | — | $11.99 |
5 rulings from Wizards of the Coast
- 13 October 2023If an effect instructs you to choose a creature type, you may choose Time Lord.
- 13 October 2023Neither "Time" nor "Lord" are creature types. Some older cards were printed with the subtype "Lord," but all of those cards have updated Oracle card text that removed that type.
- 13 October 2023To choose a card in your hand for The Seventh Doctor's ability, take a card in your hand and separate it from the others, face down. Then the defending player guesses whether the mana value of that card is greater than the number of artifacts you control. You do not have to reveal whether they guess right or wrong unless you are casting the card.
- 13 October 2023Unlike other creature types in Magic that are each only one word, the two words "Time Lord" represent a single creature subtype. Time Lord is the only two-word creature type.
- 13 October 2023If the card you chose has an {X} in its mana cost, the value of X is 0.