Holding priority, activate The Peregrine Dynamo by paying ({1} magic symbol) , copying Karn's ability.
Resolve the copy of Karn's ability, adding at least ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) that cannot be spent to cast nonartifact spells.
Activate Voltaic Construct by paying ({2} magic symbol) , untapping The Peregrine Dynamo.
Repeat from step 2.
Results
Infinite colorless mana that cannot be spent to cast nonartifact spells.