Altar of Dementia + Urza's Incubator Combos

3 known combos featuring both cards in Commander

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

Combo 1 with Priest of Gix + Priest of Urabrask + Garna, the Bloodflame

Results: Infinite black mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite self-mill · Infinite mill · Infinite red mana · Infinite sacrifice triggers · Infinite storm count · Put all creature cards from your library into your hand
Steps
  1. Cast Priest of Gix by paying {B}.
  2. Priest of Gix enters the battlefield, triggering itself, adding {B}{B}{B}.
  3. Activate Altar of Dementia by sacrificing Priest of Gix, causing target player to mill two cards.
  4. Cast Priest of Urabrask by paying {R}.
  5. Priest of Urabrask enters the battlefield, triggering itself, adding {R}{R}{R}.
  6. Activate Altar of Dementia by sacrificing Priest of Urabrask, causing target player to mill two cards.
  7. Cast Garna by paying {1}{B}{R}.
  8. Garna enters the battlefield, triggering itself.
  9. In response, activate Altar of Dementia by sacrificing Garna, causing target player to mill three cards.
  10. Resolve Garna's ability, returning Garna, Priest of Gix, Priest of Urabrask, and any other creature cards that were put into your graveyard from anywhere this turn from your graveyard to your hand.
  11. Repeat.

Combo 2 with Geralf, the Fleshwright + Pitiless Plunderer + Ebondeath, Dracolich

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite mill · Infinite self-mill · Infinite storm count · Infinite +1/+1 counters on a creature token · Infinite +1/+1 counters on a creature · Infinite death triggers
Show steps
  1. Cast Ebondeath from your graveyard by paying {B}{B}.
  2. Geralf's first ability triggers, creating a 2/2 Zombie Rogue creature token.
  3. When the Zombie Rogue enters the battlefield, Geralf's second ability triggers, putting a number of +1/+1 counters on the Zombie Rogue equal to the number of other Zombies that entered the battlefield under your control.
  4. When Ebondeath enters the battlefield, Geralf's second ability triggers, putting a number of +1/+1 counters on Ebondeath equal to the number of other Zombies that entered the battlefield under your control.
  5. Activate Altar of Dementia twice by sacrificing the Zombie Rogue and Ebondeath.
  6. When the Zombie Rogue and Ebondeath die, Pitiless Plunderer triggers twice, creating two Treasure tokens.
  7. Resolve both Altar of Dementia abilities.
  8. Activate the Treasures by tapping and sacrificing them, adding {B}{B}.
  9. Repeat.

Combo 3 with Rakdos, the Muscle + Priest of Gix + Haunted Crossroads

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite mill · Infinite self-mill · Infinite storm count · Infinite black mana · Exile your library with the ability to play the exiled cards until your next turn
Show steps
  1. Activate Altar of Dementia by sacrificing Priest of Gix.
  2. When Priest of Gix dies, Rakdos triggers.
  3. Holding priority, activate Haunted Crossroads by paying {B}, putting Priest of Gix from your graveyard onto the top of your library.
  4. Resolve the Rakdos trigger, causing you to exile the top three cards of your library with the ability to play them until your next end step.
  5. Resolve the Altar of Dementia ability from step 1.
  6. Cast Priest of Gix from exile by paying {1}
  7. When Priest of Gix enters the battlefield, it triggers, adding {B}{B}{B}.
  8. Repeat.
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