Mikaeus, the Unhallowed
Altar of Dementia
Gravelgill Axeshark

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield (Gravelgill Axeshark without a -1/-1 counter on it on the battlefield).

   Steps

How does this combo work?
1
Activate Altar of Dementia by sacrificing Gravelgill Axeshark.
2
When Gravelgill Axeshark dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3
Resolve the Altar of Dementia ability.
4
Activate Altar of Dementia by sacrificing Gravelgill Axeshark.
5
When Gravelgill Axeshark dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6
Resolve the Altar of Dementia ability.
7
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite death triggers
Infinite mill
Infinite sacrifice triggers
Infinite self-mill
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