I'd like it if Korlash worked, but I've also surrendered to the fact that some mechanics are made for decks and not cube, and grandeur seems like one of those.
Playing Sui-Black around Urza block was amazing fun, and really nerve wracking. I like that feeling of just going all in. More cards that I like in the same deck:
Pox
smallpox
nether spirit
chimeric idol
innocent blood