Fertilid + Tiller Engine + Tireless Provisioner + Thranduil's Company

Fertilid

Tiller Engine

Tireless Provisioner

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 Tiller Engine.
2. When the basic land enters, Tiller Engine, Tireless Provisioner and Thranduil's Company trigger.
3. Resolve the Tiller Engine trigger, untapping the basic land.
4. Resolve the Tireless Provisioner trigger, creating a Treasure token.
5. Resolve the Thranduil's Company trigger, putting two +1/+1 counters on Fertilid.
6. Activate the basic land by tapping it, adding 1.
7. Activate the Treasure by tapping and sacrificing it, adding
8. Repeat.

This clever loop puts your entire library's basic land supply directly onto the battlefield by turning Fertilid into a self-sustaining land-tutoring machine. Each time Fertilid uses its ability to fetch a land, Tiller Engine immediately untaps it so it can be tapped for mana, while Tireless Provisioner provides the green mana needed to sustain the loop's activation cost through its Treasure generation. Meanwhile, Thranduil's Company steps in after every land drop to replenish Fertilid's removed counters with fresh +1/+1 counters, ensuring you never run out of fuel.