Panharmonicon doubles all ETB effects of your creatures.
Tap five lands to add five mana
Pay four mana to exile Peregrine Drake and VIillage Bell Ringer with Livio
Activate Livio's ability to return Peregrine Drake and Village Bell Ringer to the battlefield
When Peregrine Drake enters the battlefield, untap five lands, then tap five lands and untap them again with the second trigger.
When Village Bell Ringer enters the battlefield, untap Livio
Repeat the process.