Nardole, Resourceful Cyborg

Legendary Artifact Creature — Scientist{1}{U}1/2

{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.)

Colour identity Blue · Undying, Doctor's companion · Commander page

In short

Nardole, Resourceful Cyborg has 4 listed printings; the most valuable is the Surge Foil printing from WHO at US$0.80 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.