Play Selesnya Sanctuary. When it enters, Tiller Engine, Selesnya Sanctuary and Springheart Nantuko trigger.
Resolve the Tiller Engine trigger, untapping Selesnya Sanctuary.
Holding priority, activate Selesnya Sanctuary by tapping it, adding .
Resolve the Selesnya Sanctuary 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 leverages the self-bouncing nature of Selesnya Sanctuary to repeatedly trigger Tiller Engine and untap the land, generating infinite mana and landfall triggers. Meanwhile, Springheart Nantuko uses those very same landfall triggers to copy your creatures, with Oracle of Mul Daya enabling the engine by letting you replay the Sanctuary directly from the top of your library while providing the target for infinite token copies.