How can you create a combo with Phyrexian Altar, Supernatural Stamina, Repository Skaab, Necroduality?
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[START OF COMBO]This combo can be formed with Phyrexian Altar, Supernatural Stamina, Repository Skaab, Necroduality

Color identity: UB
Mana cost: {B}
Steps:
  1. Cast Supernatural Stamina by paying {B}, targeting Repository Skaab.
  2. Activate Phyrexian Altar by sacrificing Repository Skaab, adding {B}.
  3. When Repository Skaab dies, it triggers, returning it from your graveyard to the battlefield.
  4. When Repository Skaab enters the battlefield, its exploit ability and Necroduality trigger.
  5. Resolve the Necroduality trigger, creating a token copy of it.
  6. When the Repository Skaab token enters the battlefield, its exploit ability triggers; choose not to sacrifice a creature.
  7. Resolve the Repository Skaab trigger from step 4, sacrificing the Repository Skaab token.
  8. Repository Skaab's second ability triggers, returning Supernatural Stamina to your hand from your graveyard.
  9. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - 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
  - Supernatural Stamina 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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