Fertilid + Tiller Engine + Nissa, Resurgent Animist + Felidar Retreat

Fertilid

Tiller Engine

Nissa, Resurgent Animist

Felidar Retreat

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 Tiller Engine.
2. When the basic land enters, Tiller Engine, Nissa and Felidar Retreat trigger.
3. Resolve the Tiller Engine trigger, untapping the basic land.
4. Resolve the Nissa trigger, adding .
5. Resolve the Felidar Retreat trigger, putting a +1/+1 counter on Fertilid.
6. Activate the basic land by tapping it, adding 1.
7. Repeat.