Fertilid + Nissa, Resurgent Animist + Obuun, Mul Daya Ancestor + Horizon Explorer

Fertilid

Nissa, Resurgent Animist

Obuun, Mul Daya Ancestor

Horizon Explorer

How it works

1. Activate Fertilid by paying 1 and removing a +1/+1 counter from it, causing you to search your library for a basic land card and put it on the battlefield untapped due to Horizon Explorer.
2. When the basic land enters, Nissa and Obuun trigger.
3. Resolve the Nissa trigger, adding .
4. Resolve the Obuun trigger, putting a +1/+1 counter on Fertilid.
5. Activate the basic land by tapping it, adding 1.
6. Repeat.