Springheart Nantuko + Golgari Rot Farm + Wayward Swordtooth + Horizon Explorer

Springheart Nantuko

Golgari Rot Farm

Wayward Swordtooth

Horizon Explorer

How it works

1. Play Golgari Rot Farm. When it enters untapped due to Horizon Explorer, Golgari Rot Farm and Springheart Nantuko trigger.
2. Holding priority, activate Golgari Rot Farm by tapping it, adding .
3. Resolve the Golgari Rot Farm 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.