Springheart Nantuko + Primal Vigor

Prerequisites

You have a land card in hand. You are able to play a land this turn. You control a land that doesn't have summoning sickness and that can tap to produce at least {G}.

Steps

1. Earthbend a land that can tap to produce at least {G}, thus animating it.
2. Cast Springheart Nantuko for its bestow cost by paying {1}{G}, attaching it to the animated land.
3. Play any land.
4. When the land enters the battlefield, Springheart Nantuko triggers, causing you to pay {1}{G} to create two token copies of the land it is attached to due to Primal Vigor.
5. When the land tokens enter the battlefield, Springheart Nantuko triggers twice.
6. Holding priority, activate the two land tokens by tapping them, adding at least {G}{G}.
7. Resolve the first Springheart Nantuko trigger, choosing not to pay and create two 1/1 Insect creature tokens due to Primal Vigor
8. Resolve the second trigger, causing you to pay {1}{G} to create two token copies of the land it is attached to due to Primal Vigor.
9. Repeat from step 5.