Impromptu Raid + Priest of Urabrask Combos

2 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite colorless mana

Combo 1 with Mortuary + Ashnod's Altar

Results: Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite red mana · Infinite sacrifice triggers
Steps
  1. Activate Ashnod's Altar by sacrificing Priest of Urabrask, adding {C}{C}.
  2. When Priest of Urabrask dies, Mortuary triggers, putting Priest of Urabrask on top of your library from your graveyard.
  3. Actviate Impromptu Raid by paying {2}{R/G}, revealing Priest of Urabrask from the top of your library and putting it onto the battlefield.
  4. When Priest of Urabrask enters the battlefield, it triggers, adding {R}{R}{R}.
  5. Repeat.

Combo 2 with Mortuary + Phyrexian Altar

Results: Infinite colored mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Phyrexian Altar by sacrificing Priest of Urabrask, adding {R/G}.
  2. When Priest of Urabrask dies, Mortuary triggers, putting Priest of Urabrask on top of your library from your graveyard.
  3. Actviate Impromptu Raid by paying {2}{R/G}, revealing Priest of Urabrask from the top of your library and putting it onto the battlefield.
  4. When Priest of Urabrask enters the battlefield, it triggers, adding {R}{R}{R}.
  5. Repeat.
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