Fertilid + Amulet of Vigor + Retreat to Kazandu + Stone-Seeder Hierophant

Fertilid

Amulet of Vigor

Retreat to Kazandu

Stone-Seeder Hierophant

How it works

1. Activate a mana-producing land by tapping it, adding at least .
2. Activate Stone-Seeder Hierophant by tapping it, untapping the land.
3. 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 onto the battlefield tapped.
4. When the basic land enters the battlefield, Amulet of Vigor and Retreat to Kazandu trigger.
5. Resolve the Amulet of Vigor trigger, untapping the basic land.
6. Resolve the Retreat to Kazandu trigger, putting a +1/+1 counter on Fertilid.
7. Activate the basic land by tapping it, adding 1.
8. Repeat.

This intricate engine turns a modest mana investment into a complete botanical sweep of your deck, fueled by Fertilid's ability to pull basic lands straight from your library using its own counters. That newly searched land doesn't just sit there: Amulet of Vigor instantly untaps it so it can immediately produce mana, while Retreat to Kazandu triggers to replace the +1/+1 counter Fertilid just spent. Meanwhile, Stone-Seeder Hierophant acts as a clever linchpin, untapping your mana source whenever a land arrives to ensure you always have the green mana required to keep the loop turning.