Altar of Dementia + Arcbound Fiend Combos

1 known combo featuring both cards in Commander

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

Combo 1 with Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite +1/+1 counters on certain creatures
Steps
  1. Activate Altar of Dementia by sacrificing Arcbound Fiend.
  2. When Arcbound Fiend dies, its modular ability and persist ability trigger.
  3. Resolve the modular trigger, putting Arcbound Fiend's +1/+1 counters on another artifact creature.
  4. Resolve the persist trigger, returning Arcbound Fiend from your graveyard to the battlefield. It will not have a -1/-1 counter on it due to its modular ability.
  5. Resolve the Altar of Dementia ability.
  6. Repeat.
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