Nardole by tapping it, adding at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) that can only be spent to cast noncreature spells.
Cast
Whim of Volrath with buyback by paying ({2} magic symbol) ({U} magic symbol) .
Chakram Retriever triggers, untapping
Nardole.
Resolve
Whim of Volrath, returning it to your hand.
Repeat.
If
Nardole has at least four counters on it, this combo nets infinite ({U} magic symbol) that can only be spent to cast noncreature spells, and you may target any other creature using