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Whenever The Fifteenth Doctor enters or attacks, millmillPut that many cards from the top of a library into its owner's graveyard. three cards. You may put an artifact card with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing 
has mana value 4. X counts as 0 except on the stack. 2 or 3 from among them into your hand.
The first nonartifact spell you cast each turn has improvise. (Your artifacts can help cast that spell. Each artifact you tap after you're done activating mana abilities pays for 
.)
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
Any creature with Doctor's companion can be a second commander alongside a Time Lord Doctor.
