Springheart Nantuko + Simic Growth Chamber + Wayward Swordtooth + Horizon Explorer

Springheart Nantuko

Simic Growth Chamber

Wayward Swordtooth

Horizon Explorer

How it works

1. Play Simic Growth Chamber. When it enters untapped due to Horizon Explorer, Simic Growth Chamber and Springheart Nantuko trigger.
2. Holding priority, activate Simic Growth Chamber by tapping it, adding .
3. Resolve the Simic Growth Chamber trigger, returning it from the battlefield to your hand.
4. Resolve the Springheart Nantuko trigger, causing you to pay 1 to create a token copy of Wayward Swordtooth.
5. Because of the additional Wayward Swordtooth token, you can play an additional land this turn.
6. Repeat.