So much chatter on the discord… hard to keep up lol!
I would agree generally that Jade Fox is underwhelming as a tech 3, I’m surprised there’s such a staunch defense of it in the discord chat. If you’re going Ninjutsu T2, it’s for Glorious Ninja and Porcupine, pretty much period (possibly Fox’s Den School in support of those two)
Ninjutsu in general has a lot of redundancy and “anti-synergies” of sorts. GN is your main unit, it has Swift Strike, yet the tech 3 unit’s big thing is it … also provides Swift Strike? And also adds flying, which is kinda nice but also… kinda tough for blocking? and flying is kinda redundant for invisibility / stealth? And the big Tech 1 unit in the spec, Inverse Power Ninja, gets wrecked into oblivion by using the Tech 3 unit or Sets’ ultimate?
I feel like a better way for Jade to “add” to the spec, she should grant long range (give all the ninjas shurikens) and maybe “may attack as if they have flying” or “pay 1: all ninjas have flying until your next turn”? I also feel like she should cost 6 instead of 8. But that’s just my opinion 
I love Sets and the Ninja theme, but I think there’s a reason Raccoon, Flying Fox, and Jade Fox don’t see a ton of play.
EDIT my ideas in this RACE game for how to buff Jade Fox to be more on par with good Tech 3s: give Ninjas +1/1 or +2/2, or give ninjas readiness. As it stands though, I hardly feel as if it hits the board and you win…