Fertilid + Lotus Cobra + Bristly Bill, Spine Sower + Horizon Explorer

Fertilid

Lotus Cobra

Bristly Bill, Spine Sower

Horizon Explorer

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 Horizon Explorer.
2. When the basic land enters, Lotus Cobra and Bristly Bill trigger.
3. Resolve the Lotus Cobra trigger, adding .
4. Resolve the Bristly Bill trigger, putting a +1/+1 counter on Fertilid.
5. Activate the basic land by tapping it, adding 1.
6. Repeat.