Cathodion + Phyrexian Altar + Sigil of the New Dawn + Urza's Incubator

W identity

Commander legal

The 4 combo pieces

What must be in place

"Construct" chosen with Urza's Incubator.

How to execute it

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

What the combo produces