Fertilid + Amulet of Vigor + Tireless Provisioner + Thranduil's Company

Fertilid

Amulet of Vigor

Tireless Provisioner

Thranduil's Company

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 Thranduil's Company 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 Thranduil's Company trigger, putting two +1/+1 counters on Fertilid.
6. Activate the basic land by tapping it, adding 1.
7. Activate the Treasure by tapping and sacrificing it, adding
8. Repeat.

This loop turns Fertilid into a relentless basic land-fetching engine by cycling its counters back onto it with every search. As each basic land enters the battlefield, Amulet of Vigor immediately untaps it so it can be tapped for mana, while Tireless Provisioner supplies the green mana required to fuel Fertilid's activation cost. Meanwhile, Thranduil's Company acts as the crucial bridge that turns those land drops into fresh +1/+1 counters to keep the creature fed, all while its static ability effortlessly accommodates the extra lands hitting the board.