This clever engine uses the backside of Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight to grant persistent immortality to your team, which Tatterkite happily exploits since its static ability inherently prevents -1/-1 counters from sticking to it. By feeding Tatterkite to Megatog's sacrifice ability, you trigger an endless cycle where the construct dies, immediately returns to the battlefield good as new, and grows Megatog to monstrously large proportions. Because Tatterkite never actually accumulates the counter that normally limits persist, this loop can be repeated endlessly to farm an infinite stream of sacrifice, death, and enter-the-battlefield triggers.