This clever loop transforms your artifact infrastructure into a self-sustaining power plant, heavily dependent on Toph, the First Metalbender to redefine every nontoken artifact you control as a land. Because of that crucial type-shifting static ability, Dreamstone Hedron is treated as a land capable of being targeted by effects that care about lands, while still retaining its innate ability to tap for three colorless mana. With Dreamstone Hedron providing the fuel, you feed that mana into Candelabra of Tawnos to untap both the Hedron and the Candelabra itself. The Candelabra resets the board by untapping these artifact-lands, allowing you to cycle the whole process indefinitely for infinite colorless mana.