Mortuary + Digsite Conservator + Ashnod's Altar + Sifter of Skulls

Mortuary

Digsite Conservator

Ashnod's Altar

Sifter of Skulls

How it works

1. Activate Ashnod's Altar by sacrificing Digsite Conservator, adding CC.
2. When Digsite Conservator dies, it, Mortuary and Sifter of Skulls trigger.
3. Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token.
4. Activate Ashnod's Altar by sacrificing the Eldrazi Scion, adding CC.
5. Resolve the Mortuary trigger, putting Digsite Conservator on top of your library from your graveyard.
6. Resolve the Digsite Conservator trigger, causing you to pay 4 to exile Digsite Conservator from the top of your library and cast it without paying its mana cost.
7. Repeat.