This clever loop turns your graveyard into a revolving door by weaving together three seemingly disparate permanents into a self-sustaining engine. Vitaspore Thallid provides the crucial sacrifice outlet that sends itself to the graveyard, triggering Yedora, Grave Gardener to immediately fish it back out and return it to the battlefield face down. Because Yedora turns that returned card into a Forest land, Life and Limb instantly steps in to grant it the Saproling type as well, ensuring that the newly minted land is also a creature ready to be sacrificed right back to Vitaspore Thallid's ability. This elegant closed circuit yields infinite death, entry, leave-the-battlefield, landfall, and sacrifice triggers whenever you need them.