Living Death
Ashnod's Altar
Verdant Eidolon
Eternal Witness

   Prerequisites

What do I need to start this combo?
Living Death in hand.
All other permanents on the battlefield.
You control at least one additional nontoken creature.
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   Steps

How does this combo work?
1
Activate Verdant Eidolon by paying and sacrificing it, adding if you have two or more available, or otherwise.
2
Activate Ashnod's Altar twice by sacrificing Eternal Witness and another nontoken creature, adding .
3
Cast Living Death by paying 3, causing each player to exile all creature cards in their graveyards, sacrifice all creatures they control, then put all cards exiled this way onto the battlefield.
4
When Eternal Witness enters the battlefield, it triggers, returning Living Death to your hand from your graveyard.
5
Repeat.

   Results

What do I get from this combo?
Infinite colorless mana
Infinite death triggers
Infinite ETB
Infinite LTB
Infinite magecraft triggers
Infinite sacrifice triggers
Infinite storm count