I brought out Die Die My Darling during every game of Magic I could. The interesting news: Omniscience is good but it isn't brilliant. It wasn't a win more effect though, as playing spells for free was very useful when I didn't have the mana.
Die, Die has a few issues. One is trying to get the combo
set up quickly enough. Another is making sure the combo lasts long
enough to win. On a couple of occasions, Path to Exile was a problem for
me (although I started naming that card with Cabal Therapy as soon as I
understood it was there to take).
There were multiple games where I got stuck with a Sensei's Divining Top out and my top two cards were Confiscate and Omniscience and I couldn't find a card to shuffle them away. I was also a little frustrated with my mana base and then, boom, it hit me.
Temple of Silence. Here's a way to let the Top work better!
Next up, was finding a replacement for Nightmare Void.
With Path being an issue, and Theros...well, existing, I have a chance to think outside the box. After pawing through every card in the binder, I have come to a conclusion:
Theros really didn't develop enchantments in an interesting or meaningful way.
That doesn't mean that there isn't anything at all, though. First, we have Archetype of Endurance, which is a pretty flashy way to solve that Path to Exile solution my opponents could run. Next, Chromanticore is an option I'm testing. Partly because, who doesn't want to try Chromanticore? But also because of the lifelink. If my combo takes too long to get going, lifelink could extend the game long enough for me to win.
Finally, I went for the obvious card: Starfield of Nyx. While I don't expect the living enchantment aspect of Starfield to ever trigger, getting back a binned Eldrazi Conscription or reusing Seal of Doom seems like a good idea.
I just need to acquire a Starfield in non-Cockatrice formats and I can test it in real life. For now I'll sub in a Primeval Bounty, just for the hell of it.