How can you create a combo with Medomai the Ageless, Idris, Soul of the TARDIS, Karn's Bastion, Memnarch?
user
[START OF COMBO]This combo can be formed with Medomai the Ageless, Idris, Soul of the TARDIS, Karn's Bastion, Memnarch

Color identity: URW
Mana cost: {2}{U}{U}{U}{R} available the first turn, with {4} each extra turn
Steps:
  1. Activate Memnarch's first ability by paying {1}{U}{U}, causing Medomai the Ageless to become an artifact.
  2. Deal combat damage to an opponent using Medomai the Ageless.
  3. Medomai the Ageless triggers, causing you to take an extra turn after this one.
  4. Cast Idris by paying {1}{U}{R}.
  5. When Idris enters the battlefield, it triggers, exiling Medomai the Ageless until Idris leaves the battlefield.
  6. Move to your extra turn.
  7. At the beginning of your upkeep, Idris's vanishing ability triggers, removing a time counter from it.
  8. Activate Karn's Bastion's second ability by paying {4} and tapping it, putting a time counter on Idris.
  9. Deal combat damage to an opponent using Idris.
  10. Idris triggers, causing you to take an extra turn after this one.
  11. Repeat from step 6.[END OF COMBO STEPS]

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

Other prerequisites:
  - Medomai the Ageless must be on the battlefield
  - Idris, Soul of the TARDIS must be in your hand
  - Karn's Bastion must be on the battlefield
  - Memnarch must be on the battlefield
  - An opponent cannot block creatures you control.
[END OF COMBO PREREQUISITES]
assistant