This clever loop turns the cycle of life and death into a self-sustaining engine, fueled by Ashnod's Altar as the sacrificial core that fuels both mana and tragedy. When Seraph of the Scales meets its end upon the altar, its afterlife 2 ability ensures you aren't left empty-handed, immediately replacing the angel with a pair of flying Spirit tokens to be fed to the Altar in turn. The generic mana produced is filtered and colored with the help of Signpost Scarecrow, providing the precise black mana needed to fund Kenrith, the Returned King. Finally, Kenrith's resurrection ability plucks the Seraph right back out of the graveyard and onto the battlefield, ready to begin the cycle anew and generate infinite sacrifices, enters-the-battlefield triggers, and death triggers.