4 Obliterators, it is that good.
More board wipe, at least in board.
More sac effects, at least in board.
Remove killing wave.
Don't use crypts, use spell bombs instead, i see you already have some, put more in if you want to but 2 should be enough.Thoughts? I have a Liliana of the Dark Realms (from the prize packs*), a third Obliterator I traded for, a Batterskull (Which struck me as a pretty nifty way of winning wars of attrition when I saw it in the mirror match), and a pair of Wurmcoil Engines I'm considering putting in, and I know I should probably add some Tormod's Crypts into the sideboard for more graveyard hate.
Liliana of the dark realms is not good enough to use.
Batterskull and wurmcoils might work.