This fascinating loop transforms a simple sacrifice into a devastating mill engine by weaving together three distinct permanent types into a self-sustaining cycle. When you sacrifice a creature to Altar of Dementia, Yedora, Grave Gardener immediately catches its demise, pulling it back from the graveyard to the battlefield face down. Ordinarily, Yedora would turn it into a plain old Forest, but the passive presence of Life and Limb dynamically redefines all Forests as 1/1 green Saproling creatures in addition to their land type. This means the newly returned permanent re-enters ready to be sacrificed right back to Altar of Dementia, letting you mill your opponents' entire libraries through an endless succession of repeatable sacrifices.