Fertilid + Tiller Engine + Nissa, Resurgent Animist + Beorn's Hospitality

Fertilid

Tiller Engine

Nissa, Resurgent Animist

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

This clever engine transforms Fertilid's activated ability into a self-sustaining loop by leveraging Tiller Engine to instantly untap the land you search for. That newly entered land triggers Nissa, Resurgent Animist to generate mana and Beorn's Hospitality to replenish Fertilid's spent +1/+1 counters. Because the land untaps immediately and pays for its own activation with the help of Nissa, Resurgent Animist, you can cycle through your entire library and flood the battlefield with basic lands.