Phyrexian Altar + River Kelpie Combos

2 known combos featuring both cards in Commander

Infinite card draw Near-infinite colored mana Near-infinite death triggers Near-infinite ETB Near-infinite LTB

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 colored mana · Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite sacrifice triggers
Steps
  1. Activate Phyrexian Altar by sacrificing Moritte of the Frost, adding one mana of any color.
  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 +1/+1 counters on it and one -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. Repeat.

Combo 2 with Vizier of Remedies

Also requires: Vizier of Remedies Vizier of Remedies
Results: Infinite card draw · Near-infinite colored mana · Near-infinite death triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite sacrifice triggers
Show steps
  1. Activate Phyrexian Altar by sacrificing River Kelpie, adding {1}.
  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. Repeat.
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