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

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

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

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