Wilhelt, the Rotcleaver + Shambling Ghast + Chthonian Nightmare + Phyrexian Altar

Wilhelt, the Rotcleaver

Shambling Ghast

Chthonian Nightmare

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Shambling Ghast, adding 1.
2. When Shambling Ghast dies, it and Wilhelt's first ability trigger.
3. Resolve the Shambling Ghast trigger, creating a Treasure token.
4. Resolve the Wilhelt trigger, creating a 2/2 Zombie creature token with decayed.
5. Activate the Treasure by tapping and sacrificing it, adding .
6. Cast Chthonian Nightmare by paying 1.
7. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
8. Activate Chthonian Nightmare by paying E, sacrificing the Zombie token, and returning Chthonian Nightmare from the battlefield to your hand, returning Shambling Ghast from your graveyard to the battlefield.
9. Repeat.