Cheapest priced copy (Doctor Who): $0.99 at Card Kingdom, foil, near mint, their price list as of .
The Fourth Doctor 
Legendary Creature — Time Lord Doctor · 4/4 · Mythic · Doctor Who · #555
You may look at the top card of your library any time.
Would You Like A...? — Once each turn, you may play a historic land or cast a historic spell from the top of your library. When you do, create a Food token. (Artifacts, legendaries, and Sagas are historic.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
8 printings · $0.99 to $14.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Doctor Who | 2 | Mythic | — | $0.99 |
| Doctor Who | 193 | Mythic | — | — |
| Doctor Who | 415 | Mythic | $1.29 | $1.99 |
| Doctor Who | 555 | Mythic | $1.49 | $1.49 |
| Doctor Who | 555z | Mythic | — | — |
| Doctor Who | 607 | Mythic | — | $0.99 |
| Doctor Who | 1006 | Mythic | — | $0.99 |
| Doctor Who | 1146 | Mythic | — | $14.99 |
8 rulings from Wizards of the Coast
- 13 October 2023If the top card of your library changes during the process of casting a spell or activating an ability, you can't look at the new top card until the process of casting the spell or activating the ability ends (all targets are chosen, all costs are paid, and so on).
- 13 October 2023Essentially, The Fourth Doctor lets you play with the top card of your library revealed only to you. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand. You may look at the top card of your library whenever you want, even if you don't have priority. This action doesn't use the stack.
- 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 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 2023If an effect instructs you to choose a creature type, you may choose Time Lord.
- 8 November 2024You can't sacrifice a Food to pay multiple costs. For example, you can't sacrifice a Food token to activate its own ability and also to activate Maraleaf Rider's ability.
- 8 November 2024Whatever you do, don't eat the delicious cards.
- 8 November 2024Food is an artifact type. Even though it appears on some creatures, it's never a creature type.