Altar of Dementia + Extruder Combos

1 known combo featuring both cards in Commander

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

Combo 1 with Gerrard, Weatherlight Hero + Cauldron of Souls

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill
Steps
  1. Activate Cauldron of Souls by tapping it, giving Gerrard persist until end of turn.
  2. Activate Extruder by sacrificing Cauldron of Souls, putting a +1/+1 counter on Gerrard.
  3. Activate Altar of Dementia by sacrificing Gerrard.
  4. When Gerrard dies, it and its persist ability trigger.
  5. Resolve the Gerrard persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  6. Resolve the second Gerrard trigger, failing to exile it as it has left your graveyard, and returning Cauldron of Souls from your graveyard to the battlefield.
  7. Resolve the Altar of Dementia ability from step 3, causing target player to mill cards equal to Gerrard's power.
  8. Repeat.
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