WUWU makes some good points however I would definitely leave the judge at home. He may be LJ's staple side-kick but every game I have seen him used he's been very lackluster.
Look into nino, he has never disappointed my guild-playing friend and if people know what he does they tend to avoid him.
Austringers are nice but if you have nino I would only take one.
Scales of justice are very nice as well. As a 0 cost you discard a control card & draw a new one. However his one cost spell (while it needs an 11 of any suit) gives a target model either + or - on it's next duel this turn (Resists on wp).
Also look into watchers. 3
SS for a wk 7 model that is NOT insignificant & can allow you to look at the top cards of your deck. Very useful for missions such as A line in the sand where markers must be 6" apart, these buggers can activate one per turn all down the line.
A sample 35ss list would look like:
LJ
Nino - 7
3
DM - 12
Scales - 2
Austringer - 5
2 Watchers - 6
Gives you a cache of 7
The main problem you will run into is that LJ is fairly straightforward, "Go forth & beat face" she doesn't have too many tricks up her sleeve like say Seamus or

'n collete. Also she is the guild anti-ressurectionist master so be prepared for a tougher time against arcanists & to a lesser extent neverborn.
If they allow you a 50ss list & you choose up to 35 per game take the above list (32) and add in:
3 Witchling stalkers - 12 (Having some anti-magic is never a bad thing)
Papa- Loco - 6 (He's kind of silly & has a 1/27 chance per turn to backfire a little but he does decent damagae & you essentially run him into your opponents line & and cast "Take Ya with me!" or if that doesn't kill him have one of your models shoot him to trigger "BOOM" that's a lot of AoE damage & will significantly help against things like the dreamer bomb.)