Altar of Dementia + Anger Combos

6 known combos featuring both cards in Commander

Infinite mill Infinite self-mill Infinite LTB Infinite ETB Infinite sacrifice triggers

Combo 1 with Selvala, Heart of the Wilds + Slimefoot and Squee

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill
Steps
  1. Activate Selvala by paying {G} and tapping it, adding at least {1}{B}{R}{G}{G}.
  2. Activate Altar of Dementia twice by sacrificing Slimefoot and Squee and Selvala.
  3. Activate Slimefoot and Squee by paying {1}{B}{R}{G} and sacrificing a Saproling, returning it and Selvala from your graveyard to the battlefield.
  4. When Slimefoot and Squee enters the battlefield, it triggers, creating a 1/1 Saproling creature token.
  5. Repeat.

Combo 2 with Jegantha, the Wellspring + Horde of Notions

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite storm count
Show steps
  1. Activate Jegantha by tapping it, adding {W}{U}{B}{R}{G} that cannot be spent to pay generic mana costs.
  2. Activate Altar of Dementia by sacrificing Jegantha.
  3. Activate Horde of Notions by paying {W}{U}{B}{R}{G}, causing you to cast Jegantha from your graveyard without paying its mana cost.
  4. Repeat.

Combo 3 with Combat Celebrant + Adarkar Valkyrie

Results: Infinite combat phases · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill
Show steps
  1. Activate Adarkar Valkyrie by tapping it, targeting Combat Celebrant.
  2. Declare Combat Celebrant as an attacker, choosing to exert it as it attacks.
  3. Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
  4. Activate Altar of Dementia by sacrificing Combat Celebrant.
  5. Combat Celebrant dies, triggering Adarkar Valkyrie, returning Combat Celebrant from your graveyard to the battlefield.
  6. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Combat Celebrant's power.
  7. Repeat.

Combo 4 with Ghired, Mirror of the Wilds + Atla Palani, Nest Tender

Results: Near-infinite mill · Near-infinite sacrifice triggers · Near-infinite self-mill · Put all creature cards from your library onto the battlefield tapped · Near-infinite ETB · Near-infinite LTB · Near-infinite death triggers
Show steps
  1. Activate Atla by paying {2} and tapping it, creating an 0/1 Egg creature token with defender.
  2. Activate Ghired by tapping a nontoken creature you control, creating a copy of the Egg token.
  3. Activate Altar of Dementia by sacrificing an Egg token.
  4. When the Egg dies, Atla triggers, causing you to reveal cards from the top of your library until you reveal a creature card and put it onto the battlefield.
  5. Resolve the Altar of Dementia ability.
  6. Repeat from step 2.

Combo 5 with Combat Celebrant + Unforgiving One + Mirror Image

Results: Infinite combat phases · Infinite mana creatures you control can produce · Infinite mill · Infinite self-mill · Infinite untap of creatures you control
Show steps
  1. Declare Combat Celebrant and Unforgiving One as attackers, choosing to exert Combat Celebrant as it attacks.
  2. Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
  3. Unforgiving One triggers, returning Mirror Image from your graveyard to the battlefield as a copy of Combat Celebrant.
  4. Activate Altar of Dementia by sacrificing Combat Celebrant, causing target player to mill cards equal to Combat Celebrant's power.
  5. Move to your next combat phase.
  6. Declare Mirror Image and Unforgiving One as attackers, choosing to exert Mirror Image as it attacks.
  7. Mirror Image triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
  8. Unforgiving One triggers, returning Combat Celebrant from your graveyard to the battlefield.
  9. Activate Altar of Dementia by sacrificing Mirror Image, causing target player to mill cards equal to Mirror Image's power.
  10. Repeat.

Combo 6 with Combat Celebrant + Unforgiving One + Clone

Results: Infinite combat phases · Infinite mana creatures you control can produce · Infinite mill · Infinite self-mill · Infinite untap of creatures you control
Show steps
  1. Declare Combat Celebrant and Unforgiving One as attackers, choosing to exert Combat Celebrant as it attacks.
  2. Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
  3. Unforgiving One triggers, returning Clone from your graveyard to the battlefield as a copy of Combat Celebrant.
  4. Activate Altar of Dementia by sacrificing Combat Celebrant, causing target player to mill cards equal to Combat Celebrant's power.
  5. Move to your next combat phase.
  6. Declare Clone and Unforgiving One as attackers, choosing to exert Clone as it attacks.
  7. Clone triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
  8. Unforgiving One triggers, returning Combat Celebrant from your graveyard to the battlefield.
  9. Activate Altar of Dementia by sacrificing Clone, causing target player to mill cards equal to Clone's power.
  10. Repeat.
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