By transforming every nonland permanent into a legendary threat, **Leyline of Singularity** sets the entire stage for this marvelous loop. When you sacrifice **Rith's Attendant** for mana, **Ratadrabik of Urborg** steps in to catch its demise, replacing the fallen creature with a fresh non-legendary Zombie copy thanks to its remarkable revival trigger. Because that newly minted token is also rendered legendary by the Leyline, it can repeat the exact same sacrifice cycle indefinitely, fueling your mana pool with endless red, green, and white energy while triggering infinite deaths and enters-the-battlefield effects.