This clever loop turns the zero-mana cost of Crookshank Kobolds into a goldmine of sacrificial energy, fueled entirely by the mana-generating sacrifice outlet of Phyrexian Altar. The missing ingredient—any piece of equipment—binds the loop together by satisfying the static condition of Koll, the Forgemaster, ensuring that your little kobold bounces right back to your hand every time it hits the graveyard rather than staying dead. Because the kobold costs zero mana to recast, you can repeat this sequence indefinitely to fuel an endless chain of deaths, enters-the-battlefield triggers, and storm count.