Fertilid + Tiller Engine + Lotus Cobra + Retreat to Kazandu

Fertilid

Tiller Engine

Lotus Cobra

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, Lotus Cobra and Retreat to Kazandu trigger.
3. Resolve the Tiller Engine trigger, untapping the basic land.
4. Resolve the Lotus Cobra trigger, adding .
5. Resolve the Retreat to Kazandu trigger, putting a +1/+1 counter on Fertilid.
6. Activate the basic land by tapping it, adding 1.
7. Repeat.