How can you create a combo with Archaeomancer, Erratic Portal, Capture of Jingzhou?
user
[START OF COMBO]This combo can be formed with Archaeomancer, Erratic Portal, Capture of Jingzhou

Color identity: U
Mana cost: {6}{U}{U}{U}{U} each turn
Steps:
  1. Cast Capture of Jingzhou by paying {3}{U}{U}, taking an extra turn after this one.
  2. Cast Archaeomancer by paying {2}{U}{U}.
  3. Archaeomancer enters the battlefield, returning Capture of Jingzhou to your hand.
  4. Activate Erratic Portal by paying {1} and tapping it, returning Archaeomancer to your hand.
  5. Move to your next turn.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Archaeomancer must be in your hand
  - Erratic Portal must be on the battlefield
  - Capture of Jingzhou must be in your hand
[END OF COMBO PREREQUISITES]
assistant