This loop turns a simple blink into an engine of endless rebirth, relying on Viscera Seer to act as the sacrificial outlet that constantly sends your pieces back to the graveyard. When Felidar Guardian enters the battlefield, its trigger targets Reveillark, but sacrificing the Guardian in response ensures Reveillark leaves play and triggers its own ability. That leaves Reveillark's leave-the-battlefield trigger free to pull both Felidar Guardian and Viscera Seer (or another small utility creature) straight back from the graveyard, resetting the entire sequence. Because Reveillark only cares about creatures with power 2 or less, both of its partners fit comfortably into its recursion net to fuel an unbroken chain of sacrifices and enter-the-battlefield effects.