Nardole by tapping it, adding at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) that can only be spent to cast noncreature spells.
Cast
Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) .
Chakram Retriever triggers, untapping
Nardole.
Resolve
Clockspinning, putting a counter on
Nardole, or putting/removing a counter from any other permanent you control, and then returning
Clockspinning to your hand.
Repeat.
Once you have infinite ({U} magic symbol) that can only be spent to cast noncreature spells, you may target any other creature using