Cathodion + Decaying Soil + Phyrexian Altar

B identity

Commander legal

The 3 combo pieces

What must be in place

You have seven or more cards in your graveyard.

How to execute it

  1. Activate Phyrexian Altar by sacrificing Cathodion, adding {1}.
  2. Cathodion dies, triggering itself and Decaying Soil.
  3. Resolve the Cathodion trigger, adding {C}{C}{C}.
  4. Resolve the Decaying Soil trigger, causing you to pay {1} to return Cathodion from your graveyard to your hand.
  5. Cast Cathodion by paying {3}.
  6. Repeat.

What the combo produces