Whenever The Fifteenth Doctor enters the battlefield or attacks,
mill (To mill a card, a player puts the top card of their library into their graveyard.) three cards. You may put an artifact card with mana value 2 or 3 from among them into your hand.
The first nonartifact spell you cast each turn has
improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .).