Fertilid + Tireless Provisioner + Retreat to Kazandu + Spelunking

Fertilid

Tireless Provisioner

Retreat to Kazandu

Spelunking

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, Tireless Provisioner and Retreat to Kazandu trigger.
3. Resolve the Tireless Provisioner trigger, creating a Treasure token.
4. Activate the Treasure by tapping and sacrificing it, 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.