Shilgengar, Sire of Famine + Metalwork Colossus + Worldwalker Helm

Shilgengar, Sire of Famine

Metalwork Colossus

Worldwalker Helm

How it works

1. Cast Metalwork Colossus by paying 0.
2. Activate Shilgengar by sacrificing Metalwork Colossus, creating a Blood and a Map token.
3. Activate Metalwork Colossus by sacrificing the Blood and Map, returning it from your graveyard to your hand.
4. Repeat.

This loop hinges on Shilgengar, Sire of Famine turning the sacrifice of Metalwork Colossus into a steady stream of resources, which Worldwalker Helm supercharges by generating extra Map tokens whenever artifact tokens are created. Because Metalwork Colossus inherently costs zero mana when you control enough noncreature artifacts, you can continuously sacrifice it and pay its self-recursion cost using the generated Blood and Map tokens. Shilgengar's triggered and activated abilities tie the whole engine together, letting you effortlessly loop your massive construct to churn out infinite artifact tokens and death triggers.