Chainer, Dementia Master
K'rrik, Son of Yawgmoth
Gray Merchant of Asphodel
Umbral Collar Zealot

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Your life total is 10 or greater. You have at least two opponents, or your devotion to black is at least ten.

   Steps

How does this combo work?
1
Activate Umbral Collar Zealot by sacrificing Gray Merchant.
2
Activate Chainer by paying 9 life due to K'rrik, returning Gray Merchant from your graveyard to the battlefield as a Nightmare in addition to its other creature types.
3
When Gray Merchant enters, it triggers, causing each opponent to lose life equal to your devotion to black and causing you to gain that much life.
4
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite death triggers
Infinite lifegain
Infinite lifegain triggers
Infinite lifeloss
Infinite sacrifice triggers
Infinite surveil
Return all creature cards from all graveyards to the battlefield under your control
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