Mikaeus, the Unhallowed
Umbral Collar Zealot
The Reaper, King No More

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield (The Reaper without a +1/+1 counter on it on the battlefield).

   Steps

How does this combo work?
1
Activate Umbral Collar Zealot by sacrificing The Reaper.
2
When The Reaper dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3
When The Reaper enters the battlefield, it triggers, putting a -1/-1 counter on it.
4
Resolve the Umbral Collar Zealot ability
5
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite death triggers
Infinite sacrifice triggers
Infinite surveil
Infinite -1/-1 counters
Infinite recursion of non-Human creatures you control
Auntie Ool, Cursewretch
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The Reaper, King No More
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Utility Artifacts
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Enchantments
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Lands
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Smoldering Marsh
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Vernal Fen
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Rootbound Crag
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Luxury Suite
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Ziatora's Proving Ground
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Undergrowth Stadium
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Sulfurous Springs
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Spire Garden
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Riveteers Overlook
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Wastewood Verge
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City of Brass
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17%synergy
Polluted Delta
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15%synergy
Raucous Theater
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9%synergy
Misty Rainforest
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12%synergy
Badlands
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9%synergy
Taiga
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9%synergy
Bayou
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9%synergy
Path of Ancestry
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3%synergy
Mana Confluence
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12%synergy
Twilight Mire
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4%synergy
Commercial District
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2%synergy
Twisted Landscape
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-5%synergy
Karplusan Forest
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-5%synergy
Blightstep Pathway
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12%synergy
Thornspire Verge
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9%synergy
Marsh Flats
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7%synergy
Windswept Heath
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5%synergy
Golgari Rot Farm
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2%synergy
Evolving Wilds
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Scalding Tarn
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5%synergy
Haunted Ridge
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Deathcap Glade
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Gemstone Caverns
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7%synergy
Darkbore Pathway
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6%synergy
Tainted Wood
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3%synergy