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 Wayward Swordtooth.
Because of the additional Wayward Swordtooth token, you can play an additional land this turn.
Repeat.
This fascinating loop turns a simple bounce land into a massive token-generating engine by taking advantage of multiple landfall triggers firing simultaneously. When Gruul Turf enters the battlefield, Stone-Seeder Hierophant untaps itself so you can rapidly tap it to untap and tap the Gruul Turf for mana before it bounces back to your hand. Meanwhile, Springheart Nantuko uses that floating mana to leverage the land drop into token copies of Wayward Swordtooth, whose static ability to play an additional land on each of your turns ensures you always have the fuel to keep replaying the Gruul Turf.