This clever loop hinges on the synergy between Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight's back face, which grants your other nontoken creatures persist, and Yahenni, Undying Partisan's sacrifice ability to protect itself while sending fodder to the graveyard. When you sacrifice Voracious Brood to Yahenni, Isilu's persist ability returns Voracious Brood to the battlefield, a transition instantly supercharged by Voracious Brood's own static growth trigger that rewards you whenever creature cards move into your graveyard. This seamless engine generates an endless storm of entry, leave-the-battlefield, and death triggers, completely fueling whatever follow-up win conditions you desire.