You don't want to use pandemonium sporadically. Top damage I've reached with one pandemonium is ~140, you want to hold out until you're certain you can do a one-turn kill, usually with two or three pandemoniums. The only time you want to use them sporadically is if they don't have healing of any sort, and you have a large number of voodoo dolls - or, you need to spend two or three on the enemy to stall them (which the deck accounts for). The upside is that if you can wait that long, the drain life alone can pull your HP up a significant amount (allowed me to EM twice).
Also, was thinking about pests, but I'm worried that the space it would take up would detract from pandemonium - anything more than eight pests would start affecting pandemonium damage, making it a iffy thing even if you wait until you have no cards left to draw.
I like the eternity idea, though; will let the deck hold on longer, meaning that if the deck has managed to stall, it not only gives the possibility of making 1 pandemonium a OHKO, but also gives a chance @ outdecking the FG. :| Would actually make pests viable in such a case.
Sundials might be a good replacement for hourglasses. I'm a bit hesitant to apply supernovas, tho, this deck is prone to bad draws which led me to narrow it down. Supernovas won't help much, as I see it; this deck is definitely not about rushing to put the cards down, and +2 quanta in every slot isn't significant. In the end, I think the one-card space occupied by supernova is a bit too costly if you don't have hourglasses.
I think something important to note is that pandemonium often inflicts gravity pull on a voodoo doll when you have a bunch. It really supplements the deck's early attempt at stalling, when you've also wiped out the enemy's minis (Ferox, Paradox, Osiris, Fire Queen, from what I've faced and beaten).
Notes (edit):
A trident works decently in the deck. But, not usually fast enough to stop FGs like Osiris. Could potentially stop Fire Queen, *has* stopped Eldnis pretty hard.
Sundial modded deck did not win nearly as much as the first posted deck. Not sure why, my guess is that my first deck got lucky. ;P
Pest and eternity versions left untested.