Eirdu, Carrier of Dawn
Phyrexian Altar
Geralf's Messenger

   Prerequisites

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

   Steps

How does this combo work?
1
Activate Phyrexian Altar by sacrificing Geralf's Messenger
2
When Geralf's Messenger dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3
When Geralf's Messenger enters, it triggers, causing an opponent to lose 2 life.
4
Activate Phyrexian Altar by sacrificing Geralf's Messenger
5
When Geralf's Messenger dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
6
When Geralf's Messenger enters, it triggers, causing an opponent to lose 2 life.
7
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite colored mana
Infinite death triggers
Infinite lifeloss
Infinite sacrifice triggers
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Duty Beyond Death
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Utility Artifacts
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Utility Lands
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Mana Artifacts
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Llanowar Wastes
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Scrubland
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Deathcap Glade
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Temple of Silence
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