Activate Putrid Imp 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 clever loop relies on Shilgengar, Sire of Famine to repeatedly turn disposable creatures into Blood tokens while your discard outlet keeps the engine fully fueled. By using Putrid Imp to pitch Ovalchase Daredevil into the graveyard, you set up a perpetual recycling loop where every Blood token that enters the battlefield immediately triggers Ovalchase Daredevil to return to your hand. Meanwhile, Tormod, the Desecrator watches cards leave your graveyard to churn out an endless army of Zombie tokens alongside your infinite artifact and sacrifice triggers.