Eirdu, Carrier of Dawn
Mighty Mutanimals
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).
You control another nontoken creature that doesn't have a -1/-1 counter on it and that has base toughness 2 or greater.

   Steps

How does this combo work?
1
Activate Ashnod's Altar by sacrificing another nontoken creature that doesn't have a -1/-1 counter on it.
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
When the creature enters, Mighty Mutanimals triggers, putting a +1/+1 counter on the creature.
4
Repeat.

   Results

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