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

Color identity: WBG
Mana cost: {3}{B}{B}
Steps:
  1. Cast Ghouls' Night Out by paying {3}{B}{B}, returning Eternal Witness from your graveyard to the battlefield, and at least two other creatures from your opponents' graveyards to the battlefield under your control.
  2. When Eternal Witness and the creatures enter the battlefield, Blessed Sanctuary triggers once for each creature, and Eternal Witness triggers once.
  3. Resolve the Eternal Witness 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 Eternal Witness, 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
  - Eternal Witness 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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