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

Color identity: UBR
Mana cost: {2}{B}
Steps:
  1. Activate Altar of Dementia by sacrificing Priest of Gix, causing target player to mill cards equal to Priest of Gix's power.
  2. Activate Priest of Gix'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. Priest of Gix enters the battlefield, adding {B}{B}{B}.
  4. Activate Altar of Dementia by sacrificing Priest of Gix.
  5. Both Priest of Gix's undying ability and Void Maw attempt to exile Priest of Gix when it would be put into your graveyard.
  6. Choose to apply the Void Maw replacement effect, exiling Priest of Gix.
  7. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Priest of Gix's power.
  8. Activate Void Maw by putting Priest of Gix from exile into your graveyard, giving Void Maw +2/+2 until end of turn.
  9. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant