Fertilid + Amulet of Vigor + Tireless Provisioner + Beorn's Hospitality

Fertilid

Amulet of Vigor

Tireless Provisioner

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 Amulet of Vigor.
2. When the basic land enters, Amulet of Vigor, Tireless Provisioner and Beorn's Hospitality trigger.
3. Resolve the Amulet of Vigor trigger, untapping the basic land.
4. Resolve the Tireless Provisioner trigger, creating a Treasure token.
5. Resolve the Beorn's Hospitality trigger, putting a +1/+1 counter on Fertilid.
6. Activate the Treasure by tapping and sacrificing it, adding .
7. Activate the basic land by tapping it, adding 1.
8. Repeat.

This brilliant loop is built around recycling Fertilid's ability using the mana generated directly by its own search. When you activate Fertilid, it fetches a basic land that immediately snaps upright thanks to Amulet of Vigor, allowing you to tap it for mana. Meanwhile, Tireless Provisioner turns that land entry into a fresh Treasure token to cover the colored cost of the next activation, while Beorn's Hospitality constantly replaces the +1/+1 counter that Fertilid just spent.