This brilliant loop begins by using Zur, Eternal Schemer's activated ability to turn All Will Be One into an enchantment creature, setting its base power and toughness to its mana value. Once Sunbond is safely attached to that newly animated enchantment creature, any source of life gain sparks a self-sustaining engine. The moment you gain life, Sunbond triggers to place a +1/+1 counter on All Will Be One. That counter placement immediately causes All Will Be One to deal damage to an opponent, which in turn triggers Sunbond's lifegain clause all over again to keep the cycle spinning infinitely.