Get Haakon, Stromgald Scourge into your graveyard (by abusing the normal discard rule), then cast him as soon as you can. Use an endless supply of Nameless Inversion for creature control to buy time for your lock. (It counts as a Knight card, thanks to Changeling.)
Cast Abyssal Persecutor and watch your opponents get confused. Then cast Platinum Angel and see even further confusion.
Since you can't lose, cast Ad Nauseam and draw out your entire library, putting yourself at a negative life total. Cast Repay in Kind to set everyone's life totals to the same. No one can lose either, being at negative life.
Get out Basal Sliver and Skeletal Changeling. Sac the Skeletal Changeling with Basal Sliver's ability (since the Changeling counts as a Sliver as well) to get into your mana pool. Then re-cast the Skeletal Changeling you just sac'd... which is possible thanks to Haakon, Stromgald Scourge and that Changeling also counts as a Knight. Then sac it again. Re-cast. Do this as many times as you want.
Then cast your Bitter Ordeal for whatever number and exile someone's library with Gravestorm copying it as many times as you sac'd your Changeling.
Use your Elixir of Immortality multiple times to repeat this as needed for everyone.
No one can win because of your Platinum Angel. No one can lose because of your Abyssal Persecutor. No one has creatures thanks to Nameless Inversion and no one has any options to destroy your Angel because you have Dash Hopes in your hand... and no one can pay any life they don't have to counter its effect.
And if they kill the Angel, you lose... but then everyone else loses as a state-based action.
Welcome to Purgatory.
P.S. You do have the option to use Nameless Inversion on your own Abyssal Persecutor or not even involve it if you want to win with Platinum Angel and a Repay in Kind... but what's the fun in that?