Headless Rider + Phyrexian Altar Combos

5 known combos featuring both cards in Commander

Infinite colored mana Infinite creature tokens Infinite death triggers Infinite ETB Infinite LTB

Combo 1 with Ghouls' Night Out + Eternal Witness

Results: Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite magecraft triggers · Infinite sacrifice triggers · Infinite storm count
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 enters the battlefield, it triggers, returning Ghouls' Night Out from your graveyard to your hand.
  3. Activate Phyrexian Altar three times by sacrificing Eternal Witness 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.

Combo 2 with Ghouls' Night Out + Salvager of Secrets

Results: Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite magecraft triggers · Infinite sacrifice triggers · Infinite storm count
Show 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.

Combo 3 with Ghouls' Night Out + Mnemonic Wall

Results: Infinite ETB · Infinite LTB · Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite magecraft triggers · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Cast Ghouls' Night Out by paying {3}{B}{B}, returning Mnemonic Wall from your graveyard to the battlefield, and at least two other creatures from your opponents' graveyards to the battlefield under your control.
  2. When Mnemonic Wall enters the battlefield, it triggers, returning Ghouls' Night Out from your graveyard to your hand.
  3. Activate Phyrexian Altar three times by sacrificing Mnemonic Wall 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.

Combo 4 with Ghouls' Night Out + Shipwreck Dowser

Results: Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite magecraft triggers · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Cast Ghouls' Night Out by paying {3}{B}{B}, returning Shipwreck Dowser from your graveyard to the battlefield, and at least two other creatures from your opponents' graveyards to the battlefield under your control.
  2. When Shipwreck Dowser enters the battlefield, it triggers, returning Ghouls' Night Out from your graveyard to your hand.
  3. Activate Phyrexian Altar three times by sacrificing Shipwreck Dowser 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.

Combo 5 with Ghouls' Night Out + Archaeomancer

Results: Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite magecraft triggers · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Cast Ghouls' Night Out by paying {3}{B}{B}, returning Archaeomancer from your graveyard to the battlefield, and at least two other creatures from your opponents' graveyards to the battlefield under your control.
  2. When Archaeomancer enters the battlefield, it triggers, returning Ghouls' Night Out from your graveyard to your hand.
  3. Activate Phyrexian Altar three times by sacrificing Archaeomancer 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.
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