Holding priority, activate Relic of Legends' second ability by tapping Acererak, adding .
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 entry trigger to repeatedly venture into the dungeon without ever having to complete the Tomb of Annihilation. By tapping Acererak to pay the cost of Relic of Legends' second ability in response to its own enter-the-battlefield trigger, you effortlessly generate the mana needed to recast the lich. Meanwhile, Heliod, the Radiant Dawn // Heliod, the Warped Eclipse quietly anchors the engine with its passive cost reduction and flash-granting abilities, ensuring you can cast your spells at instant speed and reap infinite dungeon rewards.