Activate Skirge Familiar by discarding Ovalchase Daredevil, adding .
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.
Skeleton Crew triggers, creating a 2/2 Skeleton Pirate creature token.
Repeat.
This clever loop relies on the constant recycling of Ovalchase Daredevil, which bounces right back to your hand whenever a Blood token enters the battlefield under your control. Skirge Familiar acts as the engine, turning that same Daredevil into black mana through endless discards, while Shilgengar, Sire of Famine stands ready to sacrifice creatures to pump out those crucial Blood tokens. Meanwhile, Skeleton Crew watches the graveyard for any card leaving it—such as the Daredevil returning to your hand—and rewards your hustle by flooding the board with an endless army of 2/2 Skeleton Pirate tokens.