Phyrexian Altar
Gravelgill Axeshark
Thran Vigil

   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 Phyrexian Altar 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
Thran Vigil triggers, putting a +1/+1 counter on Gravelgill Axeshark.
4
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite colored mana
Infinite death triggers
Infinite sacrifice triggers
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Instants
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