Altar of Dementia + Birgi, God of Storytelling // Harnfel, Horn of Bounty Combos

4 known combos featuring both cards in Commander

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

Combo 1 with Cormela, Glamour Thief + Demonic Gifts

Results: Infinite blue mana that can only be spent to cast instant and sorcery spells · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite magecraft triggers · Infinite mill · Infinite red mana that can only be spent to cast instant and sorcery spells · Infinite sacrifice triggers · Infinite self-mill · Infinite storm count
Steps
  1. Activate Cormela by paying {1} and tapping it, adding {U}{B}{R} that can only be spent to cast instant or sorcery spells.
  2. Cast Demonic Gifts by paying {1}{B}, targeting Cormela.
  3. Birgi triggers, adding {R}.
  4. Resolve Demonic Gifts.
  5. Activate Altar of Dementia by sacrificing Cormela.
  6. When Cormela dies, it triggers twice.
  7. Resolve the first trigger, returning Cormela from your graveyard to the battlefield.
  8. Resolve the second trigger, returning Demonic Gifts from your graveyard to your hand.
  9. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Cormela's power.
  10. Repeat.

Combo 2 with Dargo, the Shipwrecker

Results: Infinite commander casts · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill · Infinite storm count
Show steps
  1. Cast Dargo from the command zone by paying {R}.
  2. Birgi triggers, adding {R}.
  3. Activate Altar of Dementia by sacrificing Dargo.
  4. Choose to return Dargo to the command zone from your graveyard.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Dargo's power.
  6. Repeat.

Combo 3 with Rakdos, the Muscle + Shambling Ghast + Haunted Crossroads

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Infinite mill · Infinite self-mill
Show steps
  1. Activate Altar of Dementia by sacrificing Shambling Ghast.
  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. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Shambing Ghast's power.
  8. Cast Shambling Ghast from exile by paying {1}.
  9. Birgi triggers, adding {R}.
  10. Repeat.

Combo 4 with Rakdos, the Muscle + Priest of Gix + Haunted Crossroads

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite storm count · Exile your library with the ability to play the exiled cards until your next turn
Show steps
  1. Activate Altar of Dementia by sacrificing Priest of Gix.
  2. When Priest of Gix dies, Rakdos triggers.
  3. Holding priority, activate Haunted Crossroads by paying {B}, putting Priest of Gix from your graveyard onto the top of your library.
  4. Resolve the Rakdos trigger, causing you to exile the top three cards of your library with the ability to play them until your next end step.
  5. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Priest of Gix's power.
  6. Cast Priest of Gix from exile by paying {3}.
  7. Birgi triggers, adding {R}.
  8. When Priest of Gix enters the battlefield, it triggers, adding {B}{B}{B}.
  9. Repeat.
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