Altar of Dementia + Priest of Urabrask Combos

4 known combos featuring both cards in Commander

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

Combo 1 with Feldon of the Third Path + Thornbite Staff

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill
Steps
  1. Activate Feldon by paying {2}{R} and tapping it, creating a token copy of Priest of Urabrask that is an artifact in addition to its other types.
  2. When Priest of Urabrask enters the battlefield, it triggers, adding {R}{R}{R}.
  3. Activate Altar of Dementia by sacrificing Priest of Urabrask.
  4. When Priest of Urabrask dies, Feldon triggers, untapping Feldon.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Priest of Urabrask' power.
  6. Repeat.

Combo 2 with Orthion, Hero of Lavabrink + Thornbite Staff

Results: Infinite copies of creatures you control · Infinite creature tokens with haste · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite red mana · Infinite sacrifice triggers · Infinite self-mill
Show steps
  1. Activate Orthion's first ability by paying {1}{R} and tapping it, creating a token copy of Priest of Urabrask with haste.
  2. When the token Priest of Urabrask enters the battlefield, it triggers, adding {R}{R}{R}.
  3. Activate Altar of Dementia by sacrificing the Priest of Urabrask token.
  4. When the Priest of Urabrask token dies, Orthion triggers, untapping itself.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the Priest of Urabrask token's power.
  6. Repeat.
  7. Once you have infinite colored mana, you may instead use Orthion's second ability to make copies of any creature(s) you control.

Combo 3 with Priest of Gix + Garna, the Bloodflame + Urza's Incubator

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
Show 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 4 with Mortuary + Experimental Frenzy

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Activate Altar of Dementia by sacrificing Priest of Urabrask.
  2. When Priest of Urabrask dies, Mortuary triggers, putting Priest of Urabrask on top of your library from your graveyard.
  3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Priest of Urabrask's power.
  4. Cast Priest of Urabrask from the top of your library by paying {2}{R}.
  5. When Priest of Urabrask enters the battlefield, it triggers, adding {R}{R}{R}.
  6. Repeat.
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