Fertilid + Lotus Cobra + Horizon Explorer + Beorn's Hospitality

Fertilid

Lotus Cobra

Horizon Explorer

Beorn's Hospitality

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