Fertilid + Lotus Cobra + Obuun, Mul Daya Ancestor + Horizon Explorer

Fertilid

Lotus Cobra

Obuun, Mul Daya Ancestor

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 Obuun trigger.
3. Resolve the Lotus Cobra trigger, adding .
4. Resolve the Obuun trigger, putting a +1/+1 counter on Fertilid.
5. Activate the basic land by tapping it, adding 1.
6. Repeat.