This clever loop turns your graveyard into a lethal engine by using Relive the Past to animate All Will Be One as a 5/5 creature, making it a valid target for its own cascading synergy. Once you grant that animated enchantment lifelink and trigger a single instance of life gain, Archangel of Thune steps in to place a +1/+1 counter on every creature you control—including All Will Be One itself. The moment that counter is placed, All Will Be One triggers to deal 1 damage to an opponent, which immediately feeds back into Archangel of Thune thanks to the lifelink you bestowed upon it.