Eirdu, Carrier of Dawn
Umbral Collar Zealot
Selfless Police Captain

   Prerequisites

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

   Steps

How does this combo work?
1
Activate Umbral Collar Zealot by sacrificing Selfless Police Captain.
2
When Selfless Police Captain dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
3
Resolve the Umbral Collar Zealot ability.
4
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite death triggers
Infinite sacrifice triggers
Infinite surveil
Felisa, Fang of Silverquill
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High Synergy Cards
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Mind Stone
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Lands
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Godless Shrine
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Vault of Champions
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Evolving Wilds
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Concealed Courtyard
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Shadowy Backstreet
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Sunlit Marsh
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Mana Confluence
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Polluted Delta
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Bloodstained Mire
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Scrubland
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Silent Clearing
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Verdant Catacombs
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Flooded Strand
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Fabled Passage
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Myriad Landscape
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Orzhov Guildgate
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Insomnia, Crown City
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Forlorn Flats
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Umbral Expanse
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Gemstone Caverns
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Thriving Moor
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Reflecting Pool
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Cavern of Souls
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