How can you create a combo with Medomai the Ageless, Preeminent Captain, Artificial Evolution, Erratic Portal?
user
[START OF COMBO]This combo can be formed with Medomai the Ageless, Preeminent Captain, Artificial Evolution, Erratic Portal

Color identity: WU
Mana cost: {1}{U}
Steps:
  1. Cast Artificial Evolution by paying {U}, changing all instances of "Soldier" on Preeminent Captain to "Sphinx".
  2. Declare Preeminent Captain as an attacker.
  3. Preeminent Captain triggers, putting Medomai from your hand onto the battlefield tapped and attacking.
  4. Deal combat damage with Medomai, causing you to take an extra turn after this one.
  5. Activate Erratic Portal by paying {1} and tapping it, returning Medomai to your hand.
  6. Pass the turn.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Medomai the Ageless must be on the battlefield
  - Preeminent Captain must be on the battlefield
  - Artificial Evolution must be in your hand
  - Erratic Portal must be on the battlefield
  - Medomai and Preeminent Captain does not have summoning sickness.
  - Opponents can not block and kill Preeminent Captain and Medomai.
[END OF COMBO PREREQUISITES]
assistant