Altar of Dementia + Mirror Image Combos

4 known combos featuring both cards in Commander

Infinite mill Infinite self-mill Infinite death triggers Infinite ETB Infinite LTB

Combo 1 with Cavalier of Night

Also requires: Cavalier of Night Cavalier of Night
Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill
Steps
  1. Activate Altar of Dementia by sacrificing Mirror Image.
  2. When Mirror Image dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night.
  3. When Mirror Image enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature.
  4. Resolve the Altar of Dementia ability from step 1.
  5. Repeat.

Combo 2 with Vesperlark

Also requires: Vesperlark Vesperlark
Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill
Show steps
  1. Activate Altar of Dementia by sacrificing Mirror Image.
  2. When Mirror Image dies, it triggers, returning itself from your graveyard to the battlefield as a copy of Vesperlark.
  3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Mirror Image's power.
  4. Repeat.

Combo 3 with Combat Celebrant + Unforgiving One + Mass Hysteria

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 4 with Combat Celebrant + Unforgiving One + Anger

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.
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