Altar of Dementia + Mondrak, Glory Dominus Combos

2 known combos featuring both cards in Commander

Infinite self-mill Near-infinite death triggers Near-infinite ETB Near-infinite LTB Near-infinite sacrifice triggers

Combo 1 with Varina, Lich Queen + Ashnod's Altar

Results: Infinite self-mill · Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite sacrifice triggers
Steps
  1. Activate Varina by paying {2} and exiling two cards from your graveyard, creating two 2/2 Zombie creature tokens.
  2. Activate Altar of Dementia by sacrificing a Zombie, causing you to mill two cards.
  3. Activate Ashnod's Altar by sacrificing a Zombie, adding {C}{C}.
  4. Repeat.

Combo 2 with Prosper, Tome-Bound + Goldspan Dragon + Flameskull

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Exile your library · Infinite Treasure tokens
Show steps
  1. Activate Altar of Dementia by sacrificing Flameskull.
  2. When Flameskull dies, it triggers, exiling it and the top card of your library with the ability to cast one from exile this turn.
  3. Resolve the Altar of Dementia ability.
  4. Cast Flameskull from exile by paying {1}{R}{R}.
  5. Prosper's second ability triggers, creating two Treasure tokens.
  6. Activate the Treasures by tapping and sacrificing them, adding {2}{R}{R}.
  7. Repeat.
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