Gutter Grime + Nether Traitor + Phyrexian Altar

BG identity

Commander legal

The 3 combo pieces

How to execute it

  1. Activate Phyrexian Altar by sacrificing Nether Traitor, adding {B}.
  2. When Nether Traitor dies, Gutter Grime triggers, putting a slime counter on it and creating a creature token.
  3. Activate Phyrexian Altar by sacrificing the creature token, adding one mana of any color.
  4. When the creature token dies, Nether Traitor triggers, causing you to pay {B} to return Nether Traitor from your graveyard to the battlefield.
  5. Repeat.

What the combo produces