When Acererak enters, its first ability and Carnival of Souls trigger.
Resolve the Carnival of Souls trigger, causing you to add and lose 1 life.
Resolve the Acererak trigger, returning it from the battlefield to your hand, and venturing into Lost Mine of Phandelver.
Repeat.
This ingenious loop exploits Acererak the Archlich's self-bouncing nature to endlessly repeat its dungeon-venturing entry trigger for minimal investment. Carnival of Souls acts as the vital mana engine, turning each of Acererak's creature entries into black mana at the minor cost of your life total. To offset this drawback, Diamond Mare steps in to continuously regain life whenever you cast the black lich, while Ezzaroot Channeler steps up to completely eliminate Acererak's casting cost once your lifegain builds up momentum. Together, these four pieces create a perpetual motion machine that plows through the dungeon over and over again to bury your opponents in endless resources.