Yennett, Cryptic Sovereign
Doomsday
Nexus of Fate
Necropotence

   Prerequisites

What do I need to start this combo?
Doomsday in hand.
Nexus of Fate in your library.
Yennett and Necropotence on the battlefield.
Yennett does not have summoning sickness. An opponent cannot block and kill Yennett. Your life total is at least ten.
available

   Steps

How does this combo work?
1
Cast Doomsday by paying , 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.

   Results

What do I get from this combo?
Exile your library
Infinite turns
Lock
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