Chthonian Nightmare + Impulsive Pilferer + Sifter of Skulls + Shambling Ghast

Chthonian Nightmare

Impulsive Pilferer

Sifter of Skulls

Shambling Ghast

How it works

1. Cast Chthonian Nightmare by paying 1.
2. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
3. Activate Chthonian Nightmare by paying an amount of E, sacrificing Impulsive Pilferer or Shambling Ghast and returning Chthonian Nightmare from the battlefield to your hand.
4. When Impulsive Pilferer or Shambling Ghast dies, it and Sifter of Skulls trigger.
5. Resolve the Impulsive Pilferer or Shambling Ghast trigger, creating a Treasure token.
6. Resolve the Sifter of Skulls trigger, creating a 0/1 Eldrazi Spawn creature token.
7. Resolve the Chthonian Nightmare ability, returning either Impulsive Pilferer or Shambling Ghast from your graveyard to the battlefield.
8. Activate the Eldrazi Spawn by sacrificing it, adding C.
9. Activate the Treasure by tapping and sacrificing it, adding .
10. Repeat.