Fertilid + Nissa, Resurgent Animist + Retreat to Kazandu + Archelos, Lagoon Mystic

Fertilid

Nissa, Resurgent Animist

Retreat to Kazandu

Archelos, Lagoon Mystic

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 Archelos.
2. When the basic land enters, Nissa and Retreat to Kazandu trigger.
3. Resolve the Nissa trigger, adding .
4. Resolve the Retreat to Kazandu trigger, putting a +1/+1 counter on Fertilid.
5. Activate the basic land by tapping it, adding 1.
6. Repeat.