How can you create a combo with Encroaching Mycosynth, Dualcaster Mage, Roar of Reclamation, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Encroaching Mycosynth, Dualcaster Mage, Roar of Reclamation, Altar of Dementia

Color identity: URW
Mana cost: {6}{R}{R}{W}{W}
Steps:
  1. Cast Roar of Reclamation by paying {5}{W}{W}.
  2. In response, cast Dualcaster Mage by paying {1}{R}{R}.
  3. Dualcaster Mage enters the battlefield, copying Roar of Reclamation.
  4. Activate Altar of Dementia by sacrificing Dualcaster Mage, causing any player to mill two cards.
  5. Resolve a copy of Roar of Reclamation, returning all nonland permanent cards from your graveyard to the battlefield.
  6. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Put all nonland permanents in your graveyard and library onto the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Encroaching Mycosynth must be on the battlefield
  - Dualcaster Mage must be in your hand
  - Roar of Reclamation must be in your hand
  - Altar of Dementia must be on the battlefield
[END OF COMBO PREREQUISITES]
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