This loop is brilliantly sustained by Fungal Bloom, which feeds mana back into the engine while generating spore counters that Sporoloth Ancient helps leverage, alongside the static counter-doubling power of Loading Zone to amplify your gains. Phyrexian Altar acts as the ultimate engine piece by converting your freshly sprouted Saprolings into the green mana required to keep the Fungal Bloom going, while Kaya, Geist Hunter doubles the number of creature tokens created with her crucial −2 ability.