How can you create a combo with Turnabout, Mirror Sheen?
user
[START OF COMBO]This combo can be formed with Turnabout, Mirror Sheen

Color identity: UR
Mana cost: {3}{U}{U}{U/R}{U/R}, {3}{U/R}{U/R} of which are from the same type among lands
Steps:
  1. Cast Turnabout targeting yourself naming untap lands, hold priority.
  2. Activate Mirror Sheen to copy Turnabout.
  3. Let the copy resolve, choosing to untap.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite colorless mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Turnabout must be in your hand
  - Mirror Sheen must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant