Cast Buried Alive by paying {2} and two life, searching for Chainer, Viscera Seer, and Gray Merchant of Asphodel.
Cast Reanimate by paying 2 life.
returning Chainer onto the battlefield and causing you to lose five life.
Activate Chainer by paying nine life, returning Viscera Seer from your graveyard to the battlefield as a Nightmare in addition to its other creature types.
Activate Chainer by paying nine life, returning Gray Merchant of Asphodel from your graveyard to the battlefield as a Nightmare in addition to its other creature types.
Gray Merchant of Asphodel enters the battlefield, causing each opponent to lose life equal to your devotion to black and causing you to gain life equal to the amount of life lost this way.
Activate Viscera Seer by sacrificing Gray Merchant of Asphodel, scrying 1.
Repeat from step 5.

Infinite death triggers

Infinite creature ETB

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite scry 1

Return all creature cards from all graveyards to the battlefield under your control

K'rrik, Son of Yawgmoth

Buried Alive

Reanimate

Chainer, Dementia Master

Viscera Seer

Gray Merchant of Asphodel

Cast Buried Alive by paying {2} and two life, searching for Chainer, Viscera Seer, and Kokusho.
Cast Reanimate by paying 2 life.
returning Chainer onto the battlefield and causing you to lose five life.
Activate Chainer by paying nine life, returning Viscera Seer from your graveyard to the battlefield as a Nightmare in addition to its other creature types.
Activate Chainer by paying nine life, returning Kokusho from your graveyard to the battlefield as a Nightmare in addition to its other creature types.
Activate Viscera Seer by sacrificing Kokusho.
Kokusho dies, causing each opponent to lose 5 life and causing you to gain life equal to the amount of life lost this way.
Resolve the Viscera Seer, scrying 1.
Repeat from step 5.

Kokusho, the Evening Star

Cast Spellseeker, stacking Inalla's trigger under Spellseeker's ETB trigger.
Tutor Culling the Weak to hand with Spellseeker's ability.
Cast Culling the Weak, sacrificing Spellseeker and adding {B}{B}{B}{B}.
Resolve and pay for the Inalla trigger from earlier, creating a token copy of Spellseeker and leaving {B}{B}{B} floating.
When the token ETBs, tutor Unearth to your hand.
Unearth Spellseeker, leaving {B}{B} floating.
Shortcut resolving both Inalla's trigger and Spellseeker's ETB, tutoring for Burnt Offering and Finale of Promise, leaving {B} floating.
Cast Burnt Offering, sacrificing Spellseeker and adding {B}{R}{R}.
Use that mana to cast Finale of Promise with X=1 targeting Unearth and Culling the Weak.
Sacrifice a Spellseeker token to Culling the Weak for {B}{B}{B}{B} and Unearth Spellseeker.
Resolve Spellseeker's ETB and Inalla's trigger, tutoring Entomb and Reanimate into hand.
Entomb and then Reanimate Archaeomancer, leaving {B} floating.
Resolve Archaeomancer's ETB, returning Burnt Offering from your graveyard to your hand.
Cast Burnt Offering on Archaeomancer, adding {B}{B}{B}{B}.
Resolve the Inalla trigger from when Archaeomancer ETB'd and return Reanimate to your hand, leaving {B}{B}{B} floating.
Reanimate Archaeomancer and resolve the Inalla trigger, retrieving Burnt Offering and FInale of promise, {B} floating.
Sacrifice Archaeomancer to Burnt Offering, adding {R}{R}{B}{B}.
Cast Finale of Promise with X=1 targeting Entomb and Reanimate.
Entomb Shallow Grave and Reanimate Archaeomancer, {B} floating.
Resolve the Archaeomancer trigger returning Burnt Offering from your graveyard to your hand.
Sacrifice Archaeomancer to Burnt Offering, adding {B}{B}{B}{B}.
Resolve the Inalla trigger, making a token copy of Archaeomancer with haste and leaving {B}{B}{B} floating.
Return Shallow Grave with the token copy's ETB.
Cast Shallow Grave targeting Archaeomancer, leaving {B} floating.
Repeat steps 20-24 for infinite hasty Archaeomancers.

Combos with "Reanimate"