This clever loop relies on Michelangelo, On the Scene entering the battlefield with a mountain of +1/+1 counters to fund and fuel your board state, while Ashnod's Altar converts those sacrifices into a steady stream of colorless mana. When Michelangelo meets its end at the Altar, Deathrender swoops in with its triggered ability to immediately drag Michelangelo right back out of your hand and onto the battlefield, reattaching itself in the process. Meanwhile, Michelangelo's own built-in dying trigger ensures it safely returns to your hand rather than staying in the graveyard, setting the stage for the next iteration.