How can you create a combo with K'rrik, Son of Yawgmoth, Doomsday, Aphotic Wisps, Cruel Bargain, Sacrifice, Mikaeus, the Unhallowed, Walking Ballista, Viscera Seer?
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[START OF COMBO]This combo can be formed with K'rrik, Son of Yawgmoth, Doomsday, Aphotic Wisps, Cruel Bargain, Sacrifice, Mikaeus, the Unhallowed, Walking Ballista, Viscera Seer

Color identity: B
Mana cost: 
Steps:
  1. Cast Doomsday by paying 6 life, searching your library and graveyard for Cruel Bargain, Sacrifice, Mikaeus, Walking Ballista, and Viscera Seer, exiling all other cards from your graveyard and library, and then placing the remaining cards on top of your library in the order previously listed and losing half your life, rounded up.
  2. Cast Aphotic Wisps by paying 2 life, targeting K'rrik, causing you to draw a card.
  3. Cast Cruel Bargain by paying 6 life, causing you to draw four life and losing half your life, rounded up.
  4. Cast Sacrifice by paying 2 life and sacrificing K'rrik, adding {B}{B}{B}{B}{B}{B}{B}.
  5. Cast Mikaeus by paying {3}{B}{B}{B}.
  6. Cast Viscera Seer by paying {B}.
  7. Cast Walking Ballista by paying {0}.
  8. Activate Viscera Seer by sacrificing Walking Ballista.
  9. Walking Ballista undying ability triggers, returning it to the battlefield and putting +1/+1 counter on it.
  10. Activate Walking Ballista by removing +1/+1 counter, dealing 1 damage to any target.
  11. Repeat from step 8.[END OF COMBO STEPS]

Result:
  - Infinite damage
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite scry 1[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - K'rrik, Son of Yawgmoth must be on the battlefield
  - Doomsday must be in your hand
  - Aphotic Wisps must be in your hand
  - Cruel Bargain must be in the graveyard or in the library
  - Sacrifice must be in the graveyard or in the library
  - Mikaeus, the Unhallowed must be in the graveyard or in the library
  - Walking Ballista must be in the graveyard or in the library
  - Viscera Seer must be in the graveyard or in the library
  - Your life total is at least 34.
[END OF COMBO PREREQUISITES]
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