Cast Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) , targeting Harmonic Prodigy.
Orvar triggers twice and Harmonic Prodigy triggers once.
Resolve the Harmonic Prodigy trigger, giving it +1/+1 until end of turn.
Resolve the Orvar triggers, creating two token copies of Harmonic Prodigy.
Resolve Clockspinning, returning it to your hand.
Cast Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) , targeting Harmonic Prodigy.
Orvar triggers four times, and each Harmoic Prodigy triggers three times.
Resolve all Harmonic Prodigy triggers, giving each Harmonic Prodigy +3/+3 until end of turn.
Resolve all Orvar triggers, creating four token copies of Harmonic Prodigy.
Resolve Clockspinning, returning it to your hand.
Cast Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) , targeting any nonlegendary permanent you control that enters the battlefield untapped and that can tap to produce at least ({U} magic symbol) .
Orvar triggers eight times, and each Harmonic Prodigy triggers seven times.
Resolve all Harmonic Prodigy triggers, giving each Harmonic Prodigy +7/+7 until end of turn.
Resolve all Orvar triggers, creating eight copies of the mana-producing permanent.
Resolve Clockspinning, returning it to your hand.
Activate four of the copies of the mana-producing permanent by tapping them, adding at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .