Eirdu, Carrier of Dawn
Mikaeus, the Unhallowed
Bloodflow Connoisseur

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield (Eirdu as Isilu, Carrier of Twilight on the battlefield).
You control another nontoken non-Human creature with base toughness 2 or greater.

   Steps

How does this combo work?
1
Activate Bloodflow Connoisseur by sacrificing another nontoken non-Human creature
2
When the creature dies, its undying ability triggers, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it.
3
Activate Bloodflow Connoisseur by sacrificing the creature with a +1/+1 counter on it.
4
When the creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5
Resolve the Bloodflow Connoisseur abilities from step 1 and 3.
6
Repeat.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite +1/+1 counters on a creature
Celes, Rune Knight
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Planeswalkers
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Artifacts
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21%synergy
Swiftfoot Boots
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Mind Stone
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The Soul Stone
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Utility Lands
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Mana Artifacts
Sol Ring
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9%synergy
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23%synergy
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18%synergy
Fellwar Stone
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6%synergy
Mind Stone
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The Soul Stone
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12%synergy
Thought Vessel
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Marble Diamond
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7%synergy
Charcoal Diamond
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6%synergy
Lands
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39%synergy
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27%synergy
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32%synergy
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21%synergy
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Concealed Courtyard
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15%synergy
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5%synergy
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4%synergy
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3%synergy
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Evolving Wilds
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-8%synergy
Sunlit Marsh
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5%synergy
Verdant Catacombs
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-1%synergy
Windswept Heath
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-1%synergy
Terramorphic Expanse
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-5%synergy
Path of Ancestry
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-13%synergy
Silent Clearing
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3%synergy
Prismatic Vista
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2%synergy
Gemstone Caverns
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2%synergy
Reflecting Pool
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2%synergy
Arid Mesa
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-3%synergy
Bloodstained Mire
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-4%synergy
Flooded Strand
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-4%synergy
Polluted Delta
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-5%synergy