Eirdu, Carrier of Dawn
Phyrexian Altar
Evernight Shade

   Prerequisites

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

   Steps

How does this combo work?
1
Activate Phyrexian Altar by sacrificing Evernight Shade
2
When Evernight Shade dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3
Activate Phyrexian Altar by sacrificing Evernight Shade
4
When Evernight Shade dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5
Evernight Shade enters and dies as a state-based action due to having 0 toughness. Its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6
Repeat from step 3.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite colored mana
Infinite death triggers
Infinite sacrifice triggers
Eirdu, Carrier of Dawn
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