Cathars' Crusade
Aerie Ouphes

   Prerequisites

What do I need to start this combo?
Cathars' Crusade and Aerie Ouphes on the battlefield.
An additional creature with flying and indestructible on the battlefield.

   Steps

How does this combo work?
1
Activate Aerie Ouphes' ability by sacrificing itself to deal 4 damage to the creature with flying and indestructible.
2
Aerie Ouphes's Persist ability triggers, returning Aerie Ouphes from your graveyard to the battlefield with a -1/-1 counter on it.
3
Cathars' Crusade triggers, putting a +1/+1 counter on all creatures you control.
4
The -1/-1 counter and +1/+1 counter on Aerie Ouphes are removed as a state-based action.
5
Repeat.

   Results

What do I get from this combo?
Infinite death triggers
Infinite ETB
Infinite LTB
Infinite sacrifice triggers
Infinite +1/+1 counters on most creatures you control
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Lands
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Undergrowth Stadium
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Overgrown Tomb
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Stomping Ground
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Caves of Koilos
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Jungle Shrine
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Overgrown Farmland
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Brushland
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Underground Sea
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