Activate Umbral Collar Zealot by sacrificing Bloodsoaked Champion.
When Bloodsoaked Champion dies, Pitiless Plunderer and Totentanz trigger, creating a creature token and a Treasure token.
Resolve the Umbral Collar Zealot ability.
Activate Umbral Collar Zealot by sacrificing the creature token.
When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token.
Resolve the Umbral Collar Zealot ability.
Activate the Treasures by tapping and sacrificing them, adding 1.
Activate Bloodsoaked Champion by paying 1, returning it from your graveyard to the battlefield.
Repeat.
This clever little engine transforms a simple graveyard recursion loop into an absolute harvest of triggers, fueled entirely by the overlapping death benefits of your board. While Bloodsoaked Champion provides the repeating body by crawling back from the grave, Pitiless Plunderer and Totentanz, Swarm Piper turn every single demise—whether of the champion or the Rat tokens Totentanz spawns—into a fresh supply of Treasures and more fodder. Meanwhile, Umbral Collar Zealot acts as the willing executioner for your sacrifices, smoothing your draws with endless surveil while keeping the loop tightly closed.