The First Doctor is a rare Legendary Creature — Time Lord Doctor card from Doctor Who (WHO), collector number 128. Current market price: $0.24 (foil $0.34), TCGplayer market prices via Scryfall.
When The First Doctor enters, search your library and/or graveyard for a card named TARDIS, reveal it, and put it into your hand. If you search your library this way, shuffle. Whenever you cast a spell with cascade, put a +1/+1 counter on target artifact or creature.