Activate Shilgengar by sacrificing Nether Traitor.
Activate Shilgengar by sacrificing another creature.
When the creature dies, Nether Traitor triggers, causing you to pay to return Nether Traitor from your graveyard to the battlefield.
Kheru Goldkeeper and Desecrated Tomb triggers, creating a Treasure token and creature token.
Resolve the Shilgengar ability.
Activate the Treasure by tapping and sacrificing it, adding .
Repeat.
This elegant recycling engine uses Shilgengar, Sire of Famine as your primary sacrifice outlet to generate Blood tokens while sending other fodder to the graveyard. Each time a creature dies, Nether Traitor's own graveyard recursion ability triggers, allowing you to pay black mana to bring it right back to the battlefield. Because Nether Traitor and other cards are constantly leaving your graveyard, Desecrated Tomb and Kheru Goldkeeper trigger simultaneously to flood the board with Bat and Treasure tokens. You can then crack the Treasure generated by Kheru Goldkeeper to fuel Nether Traitor's return, leaving you with an endless loop of sacrifices, death triggers, and token creation.