Legendary Creature — Time Lord Doctor
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To 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.
If the card you chose has an 
in its mana cost, the value of X is 0.
Unlike 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.
Neither "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.
If an effect instructs you to choose a creature type, you may choose Time Lord.
, Sacrifice this token: Draw a card.")