Altar of Dementia + Faces of the Past Combos

3 known combos featuring both cards in Commander

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

Combo 1 with Kumena, Tyrant of Orazca + Deeproot Pilgrimage

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite creature tokens · Infinite card draw · Infinite draw triggers · Infinite +1/+1 counters on Merfolk you control · Infinite untap of all Merfolk
Steps
  1. Activate Kumena's first ability by tapping another nontoken Merfolk you control.
  2. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token.
  3. Resolve the Kumena ability.
  4. Activate Altar of Dementia by sacrificing the Merfolk token.
  5. When the Merfolk dies, Faces of the Past triggers, untapping all Merfolk.
  6. Resolve the Altar of Dementia ability.
  7. Repeat.

Combo 2 with Vhal, Candlekeep Researcher + Haunted One + Sage of Hours

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite colorless mana that can't be spent to cast spells from your hand · Infinite untap of all Humans · Infinite power for certain creatures until end of turn · Infinite untap of all Wizards
Show steps
  1. Activate Vhal by tapping it, adding an amount of {C} equal to Vhal's toughness that cannot be spent to cast spells from your hand.
  2. Haunted One triggers, causing Humans and Wizards you control to get +2/+0 and to gain undying until end of turn.
  3. Activate Sage of Hours by removing all +1/+1 counters from it.
  4. Activate Altar of Dementia by sacrificing Sage of Hours.
  5. When Sage of Hours dies, its undying ability and Faces of the Past trigger.
  6. Resolve the Sage of Hours trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. Resolve the Faces of the Past trigger, untapping all Humans and Wizards.
  8. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Sage of Hours' power.
  9. Repeat.

Combo 3 with Ghired, Mirror of the Wilds

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite untap of all Humans · Infinite untap of all Shamans
Show steps
  1. Create a creature token that is a Human and/or Shaman, and/or has changeling.
  2. Activate Ghired by tapping it, creating a copy of the creature token.
  3. Activate Altar of Dementia by sacrificing the creature token created in step 2.
  4. When the creature token dies, Faces of the Past triggers, untapping all creatures that share a creature type with it.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
  6. Repeat from step 2.
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