How can you create a combo with Rootha, Mercurial Artist, Turnabout, Aluren?
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[START OF COMBO]This combo can be formed with Rootha, Mercurial Artist, Turnabout, Aluren

Color identity: GUR
Mana cost: {1}{U}{U}
Steps:
  1. Activate all mana-producing lands you control by tapping them, adding at least {3}.
  2. Cast Turnabout by paying {2}{U}{U}.
  3. Holding priority, activate Rootha by paying {2} and returning it from the battlefield to your hand, copying Turnabout.
  4. Cast Rootha by paying {0} due to Aluren.
  5. Resolve the copy of Turnabout, untapping all lands you control.
  6. Activate all mana-producing lands you control by tapping them, adding at least {3}.
  7. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite mana lands you control can produce
  - Infinite storm count
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Rootha, Mercurial Artist must be on the battlefield
  - Turnabout must be in your hand
  - Aluren must be on the battlefield
  - Lands you control can tap to produce at least {3}.
[END OF COMBO PREREQUISITES]
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