I was wondering Nidzilla would work at lower points costs, and i came up with this 750 point list.

Hive Tyrant: Wings, 2x TL Devourers, Toxin Sacs – 151
6 Stealers - 96
6 Stealers - 96
Sniperfex: BS, VC, +1BS – 148
Sniperfex: BS, VC, +1BS – 148
Dakkafex: 2 TL Devourers, 1+BS – 113

C&C would be great.

its solid for a competitive list, but won't win you any mates in friendlies!
Its got a good mix of anti tank and anti troop and synapse shouldn't be a problem.
I wouldn't fancy taking this on myself.
You are a couple of points over though, so if its competitive, something will need to be shaved, I reckon swap toxin sacs for enhanced senses on the tyrant should do it.

Sometimes i play games with cheesy lists, but i tell them ill be playing with a cheesy list, so they can play something cheesy themselves, or take something designed to beat it.
I belive its 2 points over, which shouldnt be a problem, personally i have never run into any troubles with being 1-3 points over.