When Felidar Guardian enters the battlefield, it and Blasting Station trigger, with Felidar Guardian targeting Vesperlark.
Resolve the Blasting Station trigger, untapping it.
Holding priority, activate Blasting Station by tapping it and sacrificing Felidar Guardian.
Resolve the Felidar Guardian trigger, blinking Vesperlark.
Vesperlark leaves and enters the battlefield, triggering it and Blasting Station, with Vesperlark targeting Felidar Guardian.
Resolve the Blasting Station trigger, untapping it.
Resolve the Vesperlark trigger, returning Felidar Guardian from your graveyard to the battlefield.
Repeat from step 2.
This clever loop sets up an endless cycle of sacrifice and rebirth by cycling Felidar Guardian and Vesperlark back and forth between the battlefield and the graveyard. As each creature enters, Blasting Station’s passive untap ability ensures the artifact stays ready for action, allowing you to sacrifice Felidar Guardian for damage and immediately untap. When Vesperlark leaves the battlefield, its triggered ability reaches into the graveyard to pull Felidar Guardian right back, while its own entry triggers a fresh blink to restart the entire engine.