Holding priority, activate the creature with Dual Casting and Thornbite Staff attached by paying ({R} magic symbol) and tapping it, copying Cabaretti Charm.
Resolve the copy of Cabaretti Charm, creating two 1/1 Citizen creature tokens.
Activate Thermopod's second ability by sacrificing a Citizen, adding ({R} magic symbol) .
The Citizen dies, triggering the creature with Dual Casting and Thornbite Staff attached, untapping the creature.