This clever recursion loop relies on Maskwood Nexus to rewrite the fundamental rules of your battlefield and graveyard, turning every creature you own into a Human regardless of its printed types. When you sacrifice Angel of Glory's Rise to the waiting Phyrexian Altar to generate a mana, its own entered-the-battlefield trigger is already waiting on the stack. Because Maskwood Nexus makes the Angel a Human while it is in the graveyard, its resolution plucks the Angel right back out onto the battlefield, ready to trigger again and sustain an infinite loop of sacrifices, enters-the-battlefield effects, and colored mana.