Play Gruul Turf. When it enters, Tiller Engine, Gruul Turf and Springheart Nantuko trigger.
Resolve the Tiller Engine trigger, untapping Gruul Turf.
Holding priority, activate Gruul Turf by tapping it, adding .
Resolve the Gruul Turf trigger, returning it from the battlefield to your hand.
Resolve the Springheart Nantuko trigger, causing you to pay 1 to create a token copy of Oracle of Mul Daya.
Because of the additional Oracle of Mul Daya token, you can play an additional land this turn.
Repeat.
This clever loop hinges on Gruul Turf's self-bouncing nature to repeatedly trigger your landfall abilities without ever running out of real estate. Tiller Engine ensures the bounceland instantly untaps upon entry, letting you tap it for mana before its own return trigger resolves, while Oracle of Mul Daya grants you the extra land drop necessary to replay the Turf over and over from the top of your library. Finally, Springheart Nantuko harnesses all those recurring landfalls by repeatedly paying its bestow cost to mass-produce token copies of your creatures, turning a simple land bounce into an unstoppable engine.