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

Color identity: WU
Mana cost: {1} each turn
Steps:
  1. Attack with Preeminent Captain, putting Medomai onto the battlefield tapped and attacking.
  2. Medomai triggers on combat damage, granting you an extra turn.
  3. Tap Erratic Portal, returning Medomai to your hand.
  4. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Medomai the Ageless must be in your hand
  - Preeminent Captain must be on the battlefield
  - Maskwood Nexus must be on the battlefield
  - Erratic Portal must be on the battlefield
  - Preeminent Captain does not have summoning sickness.
  - The opponent(s) being attacked can not block and kill Preeminent Captain.
  - The opponent(s) being attacked can not block Medomai.
[END OF COMBO PREREQUISITES]
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