This ingenious loop turns your entire creature base into a renewable engine, with Ashaya, Soul of the Wild acting as the linchpin by turning every nontoken creature into a Forest land alongside its normal types. Because Stone-Seeder Hierophant and PuPu UFO are both creatures, Ashaya makes them lands too—meaning Stone-Seeder Hierophant can tap to untap PuPu UFO, while its landfall ability triggers to untap itself whenever a land enters. With that foundation set, PuPu UFO uses its tap ability to drop Selesnya Sanctuary onto the battlefield, whose own entry trigger immediately bounces it back to your hand. That returning bounce sets up the loop to repeat indefinitely, generating infinite landfall triggers to fuel your strategy.