Activate Ashnod's Altar by sacrificing Liberated Livestock, adding CC.
When Liberated Livestock dies, it, Pitiless Plunderer and Enduring Renewal trigger.
Resolve the Liberated Livestock trigger, creating a 1/1 Cat, a 1/1 Bird, and a 2/4 Ox creature token.
Resolve the Pitiless Plunderer trigger, creating a Treasure artifact token.
Resolve the Enduring Renewal trigger, returning Liberated Livestock to your hand from your graveyard.
Activate Ashnod's Altar twice by sacrificing two of the creature tokens, adding CCCC.
When the creature tokens die, Pitiless Plunderer triggers twice, creating two Treasure artifact tokens.
Activate a Treasure by tapping and sacrificing it, adding .
Cast Liberated Livestock by paying 5.
Repeat.
This clever loop relies on Enduring Renewal to continuously recycle Liberated Livestock directly back to your hand whenever it dies, bypassing the usual graveyard restrictions. Ashnod's Altar provides the initial sacrifice outlet to fuel the engine with colorless mana, while Pitiless Plunderer pitches in by generating a steady stream of Treasure tokens off every creature death. As you cycle through the loop, sacrificing the extra tokens created along the way yields all the mana needed to recast Liberated Livestock and repeat the process indefinitely.