How can you create a combo with Ghouls' Night Out, Phyrexian Altar, Headless Rider, Salvager of Secrets?
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[START OF COMBO]This combo can be formed with Ghouls' Night Out, Phyrexian Altar, Headless Rider, Salvager of Secrets

Color identity: UB
Mana cost: {3}{B}{B}
Steps:
  1. Cast Ghouls' Night Out by paying {3}{B}{B}, returning Salvager of Secrets from your graveyard to the battlefield, and at least two other creatures from your opponents' graveyards to the battlefield under your control.
  2. When Salvager of Secrets enters the battlefield, it triggers, returning Ghouls' Night Out from your graveyard to your hand.
  3. Activate Phyrexian Altar three times by sacrificing Salvager of Secrets and the two creatures your opponents own, adding {1}{B}{B}.
  4. When the three creatures die, Headless Rider triggers three times, creating three 2/2 Zombie creature tokens.
  5. Activate Phyrexian Altar twice by sacrificing two Zombies, adding {2}.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite creature tokens
  - 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:
  - Ghouls' Night Out must be in your hand
  - Phyrexian Altar must be on the battlefield
  - Headless Rider must be on the battlefield
  - Salvager of Secrets must be in the graveyard
  - At least two of your opponents have a creature card in their graveyard.
[END OF COMBO PREREQUISITES]
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