Altar of Dementia + Archghoul of Thraben Combos

2 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite mill Infinite sacrifice triggers

Combo 1 with Mortuary + Shambling Ghast

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill · Infinite storm count
Steps
  1. Activate Altar of Dementia by sacrificing Shambling Ghast.
  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, 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. Resolve the Altar of Dementia ability, causing target player to mill a number of cards equal to Shambling Ghast's power.
  7. Activate the Treasure token by tapping and sacrificing it, adding {B}.
  8. Cast Shambling Ghast by paying {B}.
  9. Repeat.

Combo 2 with Mortuary + Rooftop Storm

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill · Infinite storm count
Show steps
  1. Activate Altar of Dementia by sacrificing Archghoul of Thraben.
  2. Mortuary and Archghoul of Thraben trigger.
  3. Resolve the Mortuary trigger, putting Archghoul of Thraben on top of your library from your graveyard.
  4. Resolve the Archghoul of Thraben trigger, revealing Archghoul of Thraben from the top of your library and putting it into your hand.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Archghoul of Thraben's power.
  6. Cast Archghoul of Thraben by paying {0}.
  7. Repeat.
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