Phyrexian Altar + Shambling Ghast Combos

3 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite storm count

Combo 1 with Wilhelt, the Rotcleaver + Chthonian Nightmare

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Infinite energy counters
Steps
  1. Activate Phyrexian Altar by sacrificing Shambling Ghast, adding {1}.
  2. When Shambling Ghast dies, it and Wilhelt's first ability trigger.
  3. Resolve the Shambling Ghast trigger, creating a Treasure token.
  4. Resolve the Wilhelt trigger, creating a 2/2 Zombie creature token with decayed.
  5. Activate the Treasure by tapping and sacrificing it, adding {B}.
  6. Cast Chthonian Nightmare by paying {1}{B}.
  7. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  8. Activate Chthonian Nightmare by paying {E}, sacrificing the Zombie token, and returning Chthonian Nightmare from the battlefield to your hand, returning Shambling Ghast from your graveyard to the battlefield.
  9. Repeat.

Combo 2 with Archghoul of Thraben + Mortuary

Results: Infinite colored mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count · Infinite Treasure tokens · Reduce the toughness of creatures opponents control to 0
Show steps
  1. Activate Phyrexian Altar by sacrificing Shambling Gast, adding {B}.
  2. Mortuary, Shambling Ghast and Archghoul of Thraben trigger.
  3. Resolve the Mortuary trigger, putting Shambling Ghast on top of your library.
  4. Resolve the Shambling Ghast trigger, choosing either to give an opponent's creature -1/-1 until end of turn or creating a Treasure token.
  5. Resolve the Archghoul of Thraben trigger, revealing Shambling Ghast from the top of your library and putting it into your hand.
  6. Cast Shambling Ghast by paying {B}.
  7. Repeat.

Combo 3 with Rakdos, the Muscle + Haunted Crossroads

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count
Show steps
  1. Activate Phyrexian Altar by sacrificing Shambling Ghast, adding {1}.
  2. When Shambling Ghast dies, it and Rakdos trigger.
  3. Resolve the Shambling Ghast trigger, creating a Treasure token.
  4. Activate the Treasure by tapping and sacrificing it, adding {B}.
  5. Holding priority, activate Haunted Crossroads by paying {B}, putting Shambling Ghast from your graveyard onto the top of your library.
  6. Resolve the Rakdos trigger, exiling Shambling Ghast from the top of your library with the ability to cast it until your next turn.
  7. Cast Shambling Ghast from exile by paying {1}.
  8. Repeat.
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