This elegant loop hinges on a clever identity swap fueled by Woe Strider's sacrifice outlet. By casting Body Double as a copy of Vesperlark—or letting Vesperlark's leaves-the-battlefield trigger find Body Double waiting in the graveyard—you set up a recursive engine where the creature constantly enters as a Vesperlark and immediately triggers its own return ability when sacrificed. Woe Strider keeps the gear turning by providing both the necessary sacrifice mechanism and a steady supply of fodder, while letting you sculpt your draws with infinite scrys along the way.