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

Color identity: WUB
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 and the creatures enter the battlefield, Blessed Sanctuary triggers once for each creature, and Salvager of Secrets triggers once.
  3. Resolve the Salvager of Secrets trigger, returning Ghouls' Night Out from your graveyard to your hand.
  4. Resolve all Blessed Sanctuary triggers, creating that many 2/2 Unicorn creature tokens.
  5. Activate Phyrexian Altar five times by sacrificing Salvager of Secrets, two creatures your opponents own, and two Unicorns, adding {3}{B}{B}.
  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
  - Blessed Sanctuary 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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