This clever loop transforms a humble cleric into a self-sustaining mana engine by turning the graveyard into a greenhouse. When you sacrifice Daru Healer to Phyrexian Altar, Yedora, Grave Gardener immediately rescues it from the boneyard, slipping it back onto the battlefield face down as a fresh new Forest land. Once planted, that face-down land can be immediately turned back face up by paying its morph cost using the white mana generated by the Altar, resetting its ability to repeat the cycle while generating an excess of green mana with every iteration.