Hearthpwn

I've been working on this wild deck for the last few days, and find if I curve well I have almost 100% win rate, but if I fall behind, I don't really have the ability to reset the board unless I'm lucky enough to draw Lightbomb.  

The biggest matchup I'm having trouble with is zoo, though I have not yet had a decent curve in the games I have played which may be part of it. 

Right now, the only 2 substitutions I can think of are Harrison Jones and Cairne Bloodhoof but both are very good in the right situations.  Would another Shadow Word: Death or maybe a Deathlord be good for a replacement? I could also be be interested in swapping Shadowboxer for Flame Juggler but I really like the synergy it has if its still on board on the mid game.

Sounds like you need a little more mass removal.  Perhaps an Excavated Evil or Shadow Word: Horror.  Even a Shadow Madness can cause useful interference.

You should take out 1 Holy Nova for 1 additional Lightbomb. Without Auchenai + Circle, you lack AoE, and Lightbomb is here far better than Holy Nova. This devalues Shadowboxer a bit, so maybe change it with Wild Pyromancer, althrough you also lack spells for him. Maybe Museum Curator instead...

Cabal Shadow Priest is the best priest card in game. Play 2 of those instead of [[cairne bloodhoof]]. Cabal Shadow Priest is easier to remove, but it has more immediate impact to board and it's tempo swing is more likely to win game by it's own. Also in your deck, because you don't have any silences, stealing creatures is fine way to deal with deathrattle creatures and just stealing Leokk or Knife Juggler laying around isn't bad either.