How can you create a combo with Clever Impersonator, Estrid's Invocation, Oblivion Ring, Sage of Mysteries?
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[START OF COMBO]This combo can be formed with Clever Impersonator, Estrid's Invocation, Oblivion Ring, Sage of Mysteries

Color identity: WU
Mana cost: {4}{U}{U}{U}
Steps:
  1. Cast Estrid's Invocation by paying {2}{U}.
  2. Estrid's Invocation enters the battlefield, triggering Sage of Mysteries and itself.
  3. Resolve the Altar of Brood trigger, causing each opponent to mill a card.
  4. Resolve the Estrid's Invocation's trigger, becoming a copy of Oblivion Ring and exiling Oblivion Ring.
  5. Cast Clever Impersonator by paying {2}{U}{U}.
  6. Clever Impersonator enters the battlefield, triggering Sage of Mysteries and itself.
  7. Resolve the Altar of Brood trigger, causing each opponent to mill a card.
  8. Resolve the Clever Impersonator's trigger, becoming a copy of Estrid's Invocation and exiling Estrid's Invocation.
  9. Estrid's Invocation leaves the battlefield, returning Oblivion Ring from exile to the battlefield.
  10. Sage of Mysteries and Oblivion Ring triggers.
  11. Resolve the Altar of Brood trigger, causing each opponent to mill a card.
  12. Resolve the Oblivion Ring's trigger, exiling Clever Impersonator.
  13. Clever Impersonator leaves the battlefield, returning Estrid's Invocation from exile to the battlefield.
  14. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Clever Impersonator must be in your hand
  - Estrid's Invocation must be in your hand
  - Oblivion Ring must be on the battlefield
  - Sage of Mysteries must be on the battlefield
[END OF COMBO PREREQUISITES]
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