Altar of Dementia + Sigarda's Summons Combos

3 known combos featuring both cards in Commander

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

Combo 1 with Bishop of Wings + Cathars' Crusade

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill · Infinite +1/+1 counters on creatures you control
Steps
  1. Activate Altar of Dementia by sacrificing an Angel.
  2. Bishop of Wings triggers, creating a 1/1 Spirit creature token.
  3. The Spirit enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
  4. The Spirit token becomes a 4/4 Spirit Angel due to having a +1/+1 counter on it.
  5. Resolve Altar of Dementia's ability, causing target player to mill cards equal to the Angel's power.
  6. Activate Altar of Dementia by sacrificing the Spirit token.
  7. Repeat from step 2.

Combo 2 with Bishop of Wings + Bloodspore Thrinax

Results: Infinite death triggers · Infinite ETB · Infinite lifegain · Infinite lifegain triggers · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill
Show steps
  1. Activate Altar of Dementia by sacrificing an Angel.
  2. Bishop of Wings triggers, creating a 1/1 Spirit creature token.
  3. The Spirit enters the battlefield with at least one +1/+1 counter and becomes a 4/4 Spirit Angel due to having a +1/+1 counter on it.
  4. Bishop of Wings triggers, causing you to gain four life.
  5. Resolve Altar of Dementia's ability, causing target player to mill a number of cards equal to the sacrificed Angel's power.
  6. Activate Altar of Dementia by sacrificing the Spirit token.
  7. Repeat from step 2.

Combo 3 with Bishop of Wings + Master Biomancer

Results: Infinite death triggers · Infinite ETB · Infinite lifegain · Infinite lifegain triggers · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill
Show steps
  1. Activate Altar of Dementia by sacrificing an Angel.
  2. Bishop of Wings triggers, creating a 1/1 Spirit creature token.
  3. The Spirit enters the battlefield with at least two +1/+1 counters and becomes a 4/4 Spirit Angel due to having a +1/+1 counter on it.
  4. Bishop of Wings triggers, causing you to gain four life.
  5. Resolve Altar of Dementia's ability, causing target player to mill a number of cards equal to the sacrificed Angel's power.
  6. Activate Altar of Dementia by sacrificing the Spirit token.
  7. Repeat from step 2.
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