MTG >Combos >Sifter of Skulls +Nether Traitor +Phyrexian Altar +

Sacrifice Nether Shadow with Phyrexian Altar to add one black mana Sifter of Skulls will trigger, create an Eldrazi token Sacrifice the token to add one mana and pay one black mana to return Nether Shadow to the battlefield Repeat the process.