Nim Deathmantle + Krark-Clan Ironworks + Mintstrosity + Biotransference

Nim Deathmantle

Krark-Clan Ironworks

Mintstrosity

Biotransference

How it works

1. Activate Krark-Clan Ironworks by sacrificing Mintstrosity, adding CC.
2. When Mintstrosity dies, it and Nim Deathmantle triggers.
3. Resolve the Mintstrosity trigger, creating a Food artifact token.
4. Activate Krark-Clan Ironworks by sacrificing the Food, adding CC.
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay 4 to return Mintstrosity from your graveyard to the battlefield, and attach Nim Deathmantle to it.
6. Repeat.

This loop is a masterclass in turning artifacts and creatures into a self-sustaining engine, completely fueled by Biotransference turning Mintstrosity into an artifact creature both on the battlefield and in your graveyard. When you sacrifice Mintstrosity to Krark-Clan Ironworks, it nets you two colorless mana and triggers its own death ability to leave behind a Food token—which you can immediately sacrifice to Krark-Clan Ironworks for another two mana. That total of four mana directly pays for Nim Deathmantle's triggered ability to bring Mintstrosity right back to the battlefield, attaching the equipment in the process to ready the whole cycle for another iteration.