Fertilid + Tiller Engine + Lotus Cobra + Thranduil's Company

Fertilid

Tiller Engine

Lotus Cobra

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, Lotus Cobra and Thranduil's Company trigger.
3. Resolve the Tiller Engine trigger, untapping the basic land.
4. Resolve the Lotus Cobra trigger, adding .
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. Repeat.

This clever loop transforms Fertilid's counter-removal ability into a self-sustaining engine by cycling through your entire library for basic lands. Every time Fertilid fetches a land, Tiller Engine ensures it enters tapped and immediately untaps it, while Lotus Cobra provides the green mana needed to keep the activation cost paid. Meanwhile, Thranduil's Company acts as the crucial glue for the loop, continuously replenishing Fertilid's +1/+1 counters with each land that enters while also granting the extra land drop per turn needed to jumpstart the process.