Basri's Lieutenant
Cathars' Crusade
Altar of Dementia

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
You control at least one additional creature with at least one +1/+1 counter.

   Steps

How does this combo work?
1
Activate Altar of Dementia by sacrificing a creature with at least one +1/+1 counter.
2
Basri's Lieutenant trigger, creating a 2/2 Knight token.
3
When Knight token enters the battlefield, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control.
4
Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
5
Repeat.

   Results

What do I get from this combo?
Infinite death triggers
Infinite ETB
Infinite LTB
Infinite mill
Infinite sacrifice triggers
Infinite +1/+1 counters on creatures you control
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Battles
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Ancient Tomb
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Lands
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