Vrondiss triggers, creating a 5/4 Dragon Spirit creature token.
The Dragon Spirit enters the battlefield, triggering Dragon Tempest, causing the Dragon Spirit to deal damage to Vrondiss equal to the number of Dragons you control.
The Dragon Spirit and Vrondiss trigger.
Resolve the Dragon Spirit trigger, causing you to sacrifice it.
Resolve the Vrondiss trigger, creating a 5/4 Dragon Spirit creature token.