Nether Traitor + Sifter of Skulls + Pitiless Plunderer + Altar of Dementia

Nether Traitor

Sifter of Skulls

Pitiless Plunderer

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Nether Traitor.
2. When Nether Traitor dies, Pitiless Plunderer and Sifter of Skulls trigger.
3. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
4. Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion token.
5. Resolve the Altar of Dementia trigger, causing target player to mill one card.
6. Activate the Eldrazi Scion token by sacrificing it, adding C.
7. When the Eldrazi Scion dies, Pitiless Plunderer and Nether Traitor trigger.
8. Resolve the Pitiless Plunderer trigger, creating another Treasure token.
9. Activate a Treasure token by tapping and sacrificing it, adding .
10. Resolve Nether Traitor's trigger, paying to return it from your graveyard to the battlefield.
11. Repeat.