How can you create a combo with Felidar Guardian, Altar of the Brood, Clever Impersonator?
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[START OF COMBO]This combo can be formed with Felidar Guardian, Altar of the Brood, Clever Impersonator

Color identity: WU
Mana cost: {2}{U}{U}
Steps:
  1. Cast Clever Impersonator by paying {2}{U}{U}.
  2. Clever Impersonator enters the battlefield as a copy of Felidar Guardian, triggering Altar of the Brood and itself.
  3. Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
  4. Resolve the Clever Impersonator's trigger, blinking Felidar Guardian.
  5. Felidar Guardian enters the battlefield, triggering Altar of the Brood and itself.
  6. Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
  7. Resolve the Felidar Guardian's trigger, blinking Clever Impersonator.
  8. 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:
  - Felidar Guardian must be on the battlefield
  - Altar of the Brood must be on the battlefield
  - Clever Impersonator must be in your hand
[END OF COMBO PREREQUISITES]
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