How can you create a combo with Yennett, Cryptic Sovereign, Doomsday, Nexus of Fate, Necropotence?
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[START OF COMBO]This combo can be formed with Yennett, Cryptic Sovereign, Doomsday, Nexus of Fate, Necropotence

Color identity: WUB
Mana cost: {B}{B}{B}
Steps:
  1. Cast Doomsday by paying {B}{B}{B}, searching your library and graveyard for Nexus of Fate and four other cards, then exiling the rest of your library and graveyard, putting the aforementioned cards on top of your library with Nexus of Fate being the bottom card, and causing you to lose half your life total, rounded up.
  2. Activate Necropotence four times by paying 4 life, exiling the top four cards of your library.
  3. Declare Yennett as attacker.
  4. Yennett triggers, casting Nexus of Fate from your library without paying its mana cost.
  5. Resolve Nexus of Fate, causing you to take an extra turn after this one and shuffle Nexus of Fate into your library.
  6. Repeat from step 3 each turn.[END OF COMBO STEPS]

Result:
  - Exile your library
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Yennett, Cryptic Sovereign must be on the battlefield
  - Doomsday must be in your hand
  - Nexus of Fate must be in the library
  - Necropotence must be on the battlefield
  - Yennett does not have summoning sickness.
  - An opponent cannot block and kill Yennett.
  - Your life total is at least ten.
[END OF COMBO PREREQUISITES]
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