I think your list is already pretty good! With a plasma deck, though, you wanna be as consistent as possible. It is a very aggressive deck, made for a quick set up and T1-T2 OHKO. Here is what I would change:
Pokemon:
-1 Drifloon
- 1 Drifblim
-1 Kyurem
+ 1 Lugia
+ 1 Keldeo
+ 1 Absol
As for the...