Cathodion + Dross Scorpion + Phyrexian Altar + Prototype Portal

Mana needed: {3}

C identity

Commander legal

The 4 combo pieces

How to execute it

  1. Activate Prototype Portal by paying {3} and tapping it, creating a token copy of Cathodion.
  2. Activate Phyrexian Altar by sacrificing Cathodion, adding one mana of any color.
  3. When Cathodion dies, it and Dross Scorpion trigger.
  4. Resolve the Cathodion trigger, adding {C}{C}{C}.
  5. Resolve the Dross Scorpion trigger, untapping Prototype Portal.
  6. Repeat.

What the combo produces