This clever loop turns the battlefield into an engine of continuous rebirth by weaving together land animation and creature types. Toph, the First Metalbender provides the crucial foundation by transforming your nontoken artifacts into lands, which allows Firdoch Core—a changeling that naturally counts as every creature type—to double as both an artifact and an Ally. Because Firdoch Core is an Ally, its arrival triggers Haru, Hidden Talent to earthbend it into a living land, setting up the sacrifice. You then feed Firdoch Core to Thaumatog, sending the changeling to the graveyard where its earthbend ability immediately catches it and returns it to the battlefield tapped. Each loop feeds Thaumatog's sacrifice outlet while generating an endless cascade of enters-the-battlefield, leaving-the-battlefield, and death triggers.