Everyone needs to start playing Leyjay's version of the deck (minor red splash, 4 Liliana of the Veil maindeck, no discard except 1cmc targeted in the sideboard, Whipflare, etc.). I was able to split for 1st/2nd at a GPT this past weekend with it.
Here's a link to the most recent version:
http://www.mtggoldfish.com/deck/205957
Hymn just isn't the right card for this deck. Hymn is a better card in a faster, more aggressive deck (e.g. Team America). Yes, there are the occasional turn 2 Hymn blowouts, but I think with how durdly BUG Cascade is, you don't want too many cards that have such a low impact late game. Force of Will on the other hand is nice, because you need *some* counter spells, and you recoup the disadvantage eventually via Vision, Cascade, and Jace.
I could see 1-2 TNN making it into this deck, perhaps cutting a Goyf or Strix or two. It'd be nice to have the insurance against control and midrange, since aside from Goyf, our creatures are pretty pathetic in terms of fighting.
Standstill is bad here, and I think kinda bad in general in Legacy right now.
Toxic Deluge is interesting, but Whipflare still has several advantages over it: less mana, doesn't cost life, won't kill anything on your own board aside from DRS. I don't think fitting a single Badlands into your manabase is that much of a sacrifice.
With Lejay's version, UWR isn't too problematic as long as you can develop your board/ Try to not run yourself into Stifle or Daze needlessly. Kill their threats as they come out, and that way if they try to land a Geist (the only REALLY problematic card), Lili will be able to take care of him. Then you bring in more Whipflare from the sideboard, which kills pretty much every creature in their deck.
The only 'auto-lose' matchups this deck seems to have is UR/Mono-Red Burn, and Painter (Bloodmoon.dec). Otherwise, even combo decks can be handled with the proper sideboarding and a little luck. I was actually able to defeat Reanimator twice this weekend (in the swiss and again in the top 8).