Fertilid + Tiller Engine + Tireless Provisioner + Retreat to Kazandu

Fertilid

Tiller Engine

Tireless Provisioner

Retreat to Kazandu

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 Retreat to Kazandu trigger.
3. Resolve the Tiller Engine trigger, untapping the basic land.
4. Resolve the Tireless Provisioner trigger, creating a Treasure token.
5. Activate the Treasure by tapping and sacrificing it, adding .
6. Resolve the Retreat to Kazandu trigger, putting a +1/+1 counter on Fertilid.
7. Activate the basic land by tapping it, adding 1.
8. Repeat.