Moritte of the Frost
River Kelpie
Altar of Dementia

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield (Moritte of the Frost as a copy of River Kelpie on the battlefield).

   Steps

How does this combo work?
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.

   Results

What do I get from this combo?
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
Moritte of the Frost
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Lands
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Misty Rainforest
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Hinterland Harbor
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Foreboding Landscape
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Underground Mortuary
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Dimir Aqueduct
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Dreamroot Cascade
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Flooded Strand
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Simic Growth Chamber
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Path of Ancestry
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Barkchannel Pathway
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Prismatic Vista
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Exotic Orchard
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Cavern of Souls
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Fabled Passage
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Temple of Mystery
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Botanical Sanctum
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Overflowing Basin
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Littjara Mirrorlake
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