How can you create a combo with Moritte of the Frost, River Kelpie, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Moritte of the Frost, River Kelpie, Phyrexian Altar

Color identity: GU
Mana cost: 
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.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Near-infinite colored mana
  - Near-infinite death triggers
  - Near-infinite enters the battlefield
  - Near-infinite leaves the battlefield
  - Near-infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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