How can you create a combo with Phyrexian Altar, Not Dead After All, Repository Skaab, Necroduality?
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[START OF COMBO]This combo can be formed with Phyrexian Altar, Not Dead After All, Repository Skaab, Necroduality

Color identity: UB
Mana cost: {B}
Steps:
  1. Cast Not Dead After All by paying {B}, targeting Repository Skaab.
  2. Activate Phyrexian Altar by sacrificing Repository Skaab, adding {B}.
  3. When Repository Skaab dies, it triggers, as well as any Wicked Role token(s) that may be attached to it.
  4. Resolve the Wicked Role trigger(s), if applicable, causing each opponent to lose that much life.
  5. Resolve the Repository Skaab trigger, returning it from your graveyard to the battlefield, then creating a Wicked Role token attached to it.
  6. When Repository Skaab enters the battlefield, its exploit ability and Necroduality trigger.
  7. Resolve the Necroduality trigger, creating a token copy of it.
  8. When the Repository Skaab token enters the battlefield, its exploit ability triggers; choose not to sacrifice a creature.
  9. Resolve the Repository Skaab trigger from step 4, sacrificing the Repository Skaab token.
  10. Repository Skaab's second ability triggers, returning Not Dead After All to your hand from your graveyard.
  11. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifeloss
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Phyrexian Altar must be on the battlefield
  - Not Dead After All must be in your hand
  - Repository Skaab must be on the battlefield
  - Necroduality must be on the battlefield
[END OF COMBO PREREQUISITES]
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