Fertilid + Nissa, Resurgent Animist + Spelunking + Thranduil's Company

Fertilid

Nissa, Resurgent Animist

Spelunking

Thranduil's Company

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 Thranduil's Company trigger.
3. Resolve the Nissa trigger, adding .
4. Resolve the Thranduil's Company trigger, putting two +1/+1 counters on Fertilid.
5. Activate the basic land by tapping it, adding 1.
6. Repeat.

This elegant loop transforms basic land-tutoring into a self-sustaining engine by turning every land drop into fresh counters and mana. Fertilid acts as the catalyst, trading its own growth to pull a basic land from your library, which enters untapped thanks to Spelunking's static ability. That arriving land immediately feeds Nissa, Resurgent Animist for color-fixing mana and triggers Thranduil's Company to replenish Fertilid's removed counters, allowing you to repeat the cycle until every basic land is on the battlefield.