Eirdu, Carrier of Dawn
Umbral Collar Zealot
Flayer of the Hatebound

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield (Eirdu as Isilu, Carrier of Twilight on the battlefield and Flayer of the Hatebound without a +1/+1 counter on it on the battlefield).

   Steps

How does this combo work?
1
Activate Umbral Collar Zealot by sacrificing Flayer of the Hatebound
2
When Flayer of the Hatebound dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3
When Flayer of the Hatebound enters, it triggers, dealing damage equal to its power to any target.
4
Activate Umbral Collar Zealot by sacrificing Flayer of the Hatebound
5
When Flayer of the Hatebound dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
6
When Flayer of the Hatebound enters, it triggers, dealing damage equal to its power to any target.
7
Resolve both Umbral Collar Zealot abilities from step 1 and 4.
8
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite damage
Infinite death triggers
Infinite sacrifice triggers
Infinite surveil
Celes, Rune Knight
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High Synergy Cards
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Raucous Theater
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Shadowblood Ridge
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Evolving Wilds
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Haunted Ridge
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Geothermal Bog
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Sunlit Marsh
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Shadowy Backstreet
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Ash Barrens
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