Resolve the Gruul Turf trigger, returning it from the battlefield to your hand.
Resolve the Springheart Nantuko trigger, causing you to pay to create a token copy of Icetill Explorer.
Because of the additional Icetill Explorer token, you can play an additional land this turn.
Repeat.
This brilliant loop starts when you drop Gruul Turf, triggering a cascading dance of landfall abilities that feeds entirely upon itself. Stone-Seeder Hierophant uses its tap ability to untap the bounceland while simultaneously untapping itself from the land's entry, netting the mana needed to fuel Springheart Nantuko's bestowed ability. As you replay Gruul Turf over and over from your hand, Icetill Explorer ensures you have the land drop capacity to keep the engine rolling, while its own landfall trigger mills your library along the way.