How can you create a combo with Sedris, the Traitor King, Void Maw, Altar of Dementia, Dockside Extortionist?
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[START OF COMBO]This combo can be formed with Sedris, the Traitor King, Void Maw, Altar of Dementia, Dockside Extortionist

Color identity: UBR
Mana cost: {2}{B}
Steps:
  1. Activate Altar of Dementia by sacrificing Dockside Extortionist, causing target player to mill cards equal to Dockside Extortionist's power.
  2. Activate Dockside Extortionist's unearth ability by paying {2}{B}, returning it from your graveyard to the battlefield, giving it haste and exiling it at end of turn or when it leaves the battlefield.
  3. Dockside Extortionist enters the battlefield, creating at least four Treasure tokens.
  4. Activate three of the Treasure tokens by tapping and sacrificing them, adding {2}{B}.
  5. Activate Altar of Dementia by sacrificing Dockside Extortionist.
  6. Both Dockside Extortionist's undying ability and Void Maw attempt to exile Dockside Extortionist when it would be put into your graveyard.
  7. Choose to apply the Void Maw replacement effect, exiling Dockside Extortionist.
  8. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Dockside Extortionist's power.
  9. Activate Void Maw by putting Dockside Extortionist from exile into your graveyard, giving Void Maw +2/+2 until end of turn.
  10. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinitely large Void Maw until end of turn
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Infinite Treasure tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Opponents control at least four aritfacts and/or enchantments.
[END OF COMBO PREREQUISITES]
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