How can you create a combo with Pattern of Rebirth, The Cauldron of Eternity, Iridescent Drake, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Pattern of Rebirth, The Cauldron of Eternity, Iridescent Drake, Altar of Dementia

Color identity: BGU
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Iridescent Drake.
  2. When Iridescent Drake dies, The Cauldron of Eternity and Pattern of Rebirth trigger.
  3. Resolve the Cauldron of Eternity trigger, putting Iridescent Drake on the bottom of your library from your graveyard.
  4. Resolve the Pattern of Rebirth trigger, putting Iridescent Drake from your library onto the battlefield.
  5. When Iridescent Drake enters the battlefield, it triggers, returning Pattern of Rebirth from your graveyard to the battlefield attached to Iridescent Drake.
  6. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Iridescent Drake's power.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Pattern of Rebirth attached to Iridescent Drake.
[END OF COMBO PREREQUISITES]
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