how could i improve it?
I would usually have at least one manipulation clans (atk/power) in half decks. So if you're thinking of swapping Nightmare to other clans, personally, I suggest Junkz (Gibson/Qubik/Veenyle Cr/Flanagan) or maybe Uppers would work well too (Maurice/Oxen/Harold/Wendel).
However, if you're really set into using Pussycats, I'd recommend Diana/Lois Ld/Wanda/Brittany for the half. Otherwise, Nightmare Rage&list looks pretty good in my opinion
Interesting deck. I would personally change Kostner to Jeffrey and Edwin to Sargh.
p.s if you want to make a link which is just the deck name, like this Nightmare Rage, the you only copy the "preset=2099229" and change the = to :