Activate a Treasure by tapping and sacrificing it, adding .
Krenko triggers, causing you to pay to create a 1/1 Goblin creature token with haste.
Activate Shilgengar by sacrificing the Goblin token.
When the Goblin dies, Pitiless Plunderer triggers, creating a Treasure token.
Resolve the Shilgengar ability
Repeat.
This delightful loop turns a single sacrifice into a self-sustaining engine by cycling resources between treasures, blood, and goblins. You kick things off by cracking a Treasure token for mana, which Krenko, Baron of Tin Street eagerly watches go to the graveyard so you can pay to create a hasty Goblin token. From there, you feed that Goblin to Shilgengar, Sire of Famine to generate a Blood token, and the moment the Goblin bites the dust, Pitiless Plunderer steps in to replace it with a brand-new Treasure token to fund the next iteration.