Nardole, Resourceful Cyborg is a rare Legendary Artifact Creature — Scientist card from Doctor Who (WHO), collector number 956. Current market price: — (foil $0.67), TCGplayer market prices via Scryfall.
{T}: Add {U} for each counter on Nardole. Spend this mana only to cast noncreature spells. Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.) Doctor's companion (You can have two commanders if the other is the Doctor.)