Fertilid + Nissa, Resurgent Animist + Spelunking + Beorn's Hospitality

Fertilid

Nissa, Resurgent Animist

Spelunking

Beorn's Hospitality

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 Spelunking.
2. When the basic land enters, Nissa and Beorn's Hospitality trigger.
3. Resolve the Nissa trigger, adding .
4. Resolve the Beorn's Hospitality trigger, putting a +1/+1 counter on Fertilid.
5. Activate the basic land by tapping it, adding 1.
6. Repeat.