Trying to be competative but something like OMG what is he thinking and catching my opponent off guard.
Well, you're halfway there. . . .
Sorry, but the list is terrible. I can't even imagine a scenario in which you'd be able to pull a draw against
1) Any Orks
2) Mech Eldar
3) Any Tau
4) Marine or
IG SAFH
5) Nidzilla
and the list goes on.
You really need to trim the fat. The Lord is inefficient at his role.
PEngines or Arcos are fine, but taking both means you've overinvested in joke units; the rest of the list is not uber cheesy and never will be, so you can't afford that luxury.
ISTs are only useful for their specials, so 10-man squads are wasteful. A plasma gun on a Priest is an awful idea.
Lastly, if you must take 4 PEngines, take them as 2 1 1, not 2 2.
Basically, I think you need to take a step back and ask yourself how this list is going to win games. To me, it looks like you're just throwing a random assortment of units on the table and crossing your fingers.