Altar of Dementia + River Kelpie Combos

2 known combos featuring both cards in Commander

Infinite card draw Near-infinite death triggers Near-infinite ETB Near-infinite LTB Near-infinite mill

Combo 1 with Moritte of the Frost

Also requires: Moritte of the Frost Moritte of the Frost
Results: Infinite card draw · Infinite draw triggers · Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite mill · Near-infinite sacrifice triggers · Infinite self-mill
Steps
  1. Activate Altar of Dementia by sacrificing Moritte of the Frost.
  2. When Moritte of the Frost dies, its persist ability triggers, returning it from your graveyard to the battlefield as a copy of River Kelpie with two additional +1/+1 counters on it and a -1/-1 counter on it.
  3. Remove one +1/+1 counter and one -1/-1 counter from Moritte of the Frost as a state-based action.
  4. When Moritte of the Frost enters the battlefield, it and River Kelpie's first ability triggers, causing you to draw two cards.
  5. Resolve the Altar of Dementia ability from step 1, milling target player a number of cards equal to Moritte of the Frost's power at the time of activation.
  6. Repeat.

Combo 2 with Vizier of Remedies

Also requires: Vizier of Remedies Vizier of Remedies
Results: Infinite card draw · Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite mill · Near-infinite sacrifice triggers
Show steps
  1. Activate Altar of Dementia by sacrificing River Kelpie.
  2. River Kelpie's persist triggers, returning it from your graveyard to the battlefield.
  3. River Kelpie enters the battlefield, causing you to draw.
  4. Resolve the Altar of Dementia trigger, causing target player to mill three cards.
  5. Repeat.
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