Phyrexian Altar + Supernatural Stamina + Repository Skaab + Necroduality

Phyrexian Altar

Supernatural Stamina

Repository Skaab

Necroduality

How it works

1. Cast Supernatural Stamina by paying , targeting Repository Skaab.
2. Activate Phyrexian Altar by sacrificing Repository Skaab, adding .
3. When Repository Skaab dies, it triggers, returning it from your graveyard to the battlefield.
4. When Repository Skaab enters the battlefield, its exploit ability and Necroduality trigger.
5. Resolve the Necroduality trigger, creating a token copy of it.
6. When the Repository Skaab token enters the battlefield, its exploit ability triggers; choose not to sacrifice a creature.
7. Resolve the Repository Skaab trigger from step 4, sacrificing the Repository Skaab token.
8. Repository Skaab's second ability triggers, returning Supernatural Stamina to your hand from your graveyard.
9. Repeat.

This loop thrives on an endless resurrection cycle where Repository Skaab continuously exploits its own copies to endlessly recycle resources. Every time you cast Supernatural Stamina to ensure the original creature returns from the grave, Phyrexian Altar provides the mana needed to keep the engine running while turning each sacrifice into a profit. Meanwhile, Necroduality doubles up your entry triggers by generating a token copy whenever a nontoken Zombie enters, creating the fodder required to fuel the Skaab's exploit ability without ever running out of fuel.