Blessed Sanctuary + Eternal Witness Combos

1 known combo featuring both cards in Commander

Infinite magecraft triggers Infinite sacrifice triggers Infinite storm count Infinite colored mana Infinite creature tokens

Combo 1 with Ghouls' Night Out + Phyrexian Altar

Also requires: Ghouls' Night Out Ghouls' Night Out Phyrexian Altar Phyrexian Altar
Results: Infinite magecraft triggers · Infinite sacrifice triggers · Infinite storm count · Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB
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.
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