How can you create a combo with The Sixth Doctor, Romana II, Teferi, Who Slows the Sunset?
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[START OF COMBO]This combo can be formed with The Sixth Doctor, Romana II, Teferi, Who Slows the Sunset

Color identity: GWU
Mana cost: {2}{W}{U}
Steps:
  1. Cast Teferi by paying {2}{W}{U}.
  2. The Sixth Doctor triggers, copying the Teferi spell, with the copy being nonlegendary.
  3. Resolve both Teferi spells.
  4. Activate a mana-producing land or artifact by tapping it, adding at least {1}.
  5. Activate Romana II by paying {1} and tapping it, creating a copy of the Teferi token.
  6. Activate a Teferi token's first loyalty ability by putting a loyalty counter on it, untapping Romana II, the mana-producing land or artifact and up to one other land or artifact, and causing you to gain 2 life.
  7. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite mana artifacts you control can produce
  - Infinite mana lands you control can produce
  - Infinite Teferi, Who Slows the Sunset tokens
  - Infinite untap of artifacts you control
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - The Sixth Doctor must be on the battlefield
  - Romana II must be on the battlefield
  - Teferi, Who Slows the Sunset must be in your hand
  - Romana II does not have summoning sickness.
  - You control a mana-producing land and/or artifact.
[END OF COMBO PREREQUISITES]
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