This clever loop transforms zero-mana creature deployment into an infinite engine by leveraging a clever typing trick. With Ashaya, Soul of the Wild on the battlefield, your non-token creatures like Crookshank Kobolds are also Forest lands, and Rootpath Purifier ensures those creatures and your entire library are treated as basic lands. This allows Murasa Rootgrazer's second ability to target the freshly cast Crookshank Kobolds, bouncing it back to your hand as if it were a basic land. When you replay the free Crookshank Kobolds, Retreat to Coralhelm triggers its landfall ability to untap Murasa Rootgrazer, letting you repeat the process indefinitely for infinite storm count, creature enters-the-battlefield triggers, and landfall triggers.