Fertilid + Lotus Cobra + Spelunking + Obuun, Mul Daya Ancestor

Fertilid

Lotus Cobra

Spelunking

Obuun, Mul Daya Ancestor

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 Spelunking.
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.