Teshar, Ancestor's Apostle + Scrap Trawler + Carrion Feeder + Tormod's Crypt

Teshar, Ancestor's Apostle

Scrap Trawler

Carrion Feeder

Tormod's Crypt

How it works

1. Cast Tormod's Crypt by paying its mana cost.
2. Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield.
3. Activate Tormod's Crypt by tapping and sacrificing it.
4. Activate Carrion Feeder by sacrificing Scrap Trawler.
5. When Scrap Trawler dies, it triggers, returning Tormod's Crypt from your graveyard to your hand.
6. Resolve the Carrion Feeder ability.
7. Repeat.

This loop functions as a self-sustaining engine built entirely around cheap artifacts and graveyard recursion. By casting Tormod's Crypt, you trigger Teshar, Ancestor's Apostle to pull Scrap Trawler straight out of your graveyard and back onto the battlefield. From there, you use Carrion Feeder to sacrifice Scrap Trawler, which triggers Scrap Trawler's own ability to return Tormod's Crypt from your graveyard right back to your hand. Because Tormod's Crypt costs zero mana to cast, you can immediately replay it to restart the whole sequence, feeding Carrion Feeder infinitely large while generating endless artifact and creature triggers.