Activate Aeromoeba by discarding Ovalchase Daredevil.
Activate Shilgengar's first ability by sacrificing another creature, creating a Blood token.
When the Blood enters the battlefield, Ovalchase Daredevil triggers, returning Ovalchase Daredevil from your graveyard to your hand.
Tormod triggers, creating a 2/2 Zombie creature token.
Repeat.
This gruesome recycling engine is fueled by Aeromoeba's ability to discard Ovalchase Daredevil straight into the graveyard. Once in the yard, every Blood token created by sacrificing a creature to Shilgengar, Sire of Famine triggers Ovalchase Daredevil to bounce right back to your hand, ready to be discarded all over again. Meanwhile, Tormod, the Desecrator watches cards leave your graveyard and rewards every single loop by churning out an endless horde of Zombie tokens.