Eirdu, Carrier of Dawn
Sin, Unending Cataclysm
Ashnod's Altar

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield (Eirdu as Isilu, Carrier of Twilight on the battlefield and Sin without a -1/-1 counter on it on the battlefield).
You control another nontoken creature with base toughness 2 or greater that does not have a -1/-1 counter on it.

   Steps

How does this combo work?
1
Activate Ashnod's Altar by sacrificing the additional creature.
2
When the creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3
Activate Ashnod's Altar by sacrificing Sin.
4
When Sin dies, it triggers twice.
5
Resolve the first trigger, returning Sin from your graveyard to the battlefield with a -1/-1 counter on it. As Sin enters, remove the -1/-1 counter from the creature sacrificed in step 1, causing Sin to enter with a +1/+1 counter on it instead.
6
Resolve the second Sin trigger, putting the counters it had on it when it was sacrificed onto a creature you control and failing to shuffle it into your library as it's no longer in your graveyard.
7
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite colorless mana
Infinite death triggers
Infinite sacrifice triggers
Infinite +1/+1 counters on creatures you control
Esika, God of the Tree
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