side deck for cruel control 5 color control questions

[bored2319]

Like some others I am playing 5 Color Control at states, can someone tell me why jace is good against a mirror match in the side deck? Is it good for anything else? In my mind its three mana and u have to wait 2 turns to draw 3 total, minus the jace its a net gain of 1 card, mulldrifter gives you two for 1 in an instant with a net gain of one and maybe a 2/2 flier

so far my side deck is as follows

1 condemn (2 in deck) vs kithkin,rdw, reveilark & misc aggro deck
2 negate (2 in deck) vs mirror, rdw
2 remove souls (2 in deck) vs rdw, kithkin,faeries, reveilark & misc aggro deck
1 firespout (0 in deck) vs kithkin,faeries & misc aggro deck
1 gutteral response (0 in deck) vs control of anykind so I can win a counter match
2 cloudthresher (2 in deck ) vs faeries
1 Jund charm (0 in deck) vs faeries, kithkin & reveilark
1 mindshatter (1 in deck) vs mirror, faeries & misc control

My main deck is a variant of the ones posted on starcity and mtg.com, with nothing excpetionally different, I have 4 slots left open, I'm considering jayce if I can understand why. I have oona on my mtgol acct and i never seem to use her so i don see her use either. My only though is to possible\y use vexing shushers vs mirror and faerie as he is my own bain at times and usually miror sides out its firespout, pyroclasms and wraths any ideas or explanatuions here?

[IthilanorStPete]

Jace (or Ajani Vengeant, for similar reasons) is good for the mirror because once they're resolved, they're tough to remove, and they can create a lot of long-term advantage. Remember, you're playing a control mirror - you're going to have a lot of time for Jace (or Vengeant) to create an advantage.
Your SB really, really depends on your MD in QnT, depending on what sweepers and what # thereof you're running, what spot removal, what counterspells, what creatures, etc. It's hard to give specific SB recommendations without a MD to work from.

[bored2319]

My main deck:

Cruel ultimatium x 2
Condemn x2
bant Charm x3
esper charm x3
Cryptic command x 4
remove soul x 2
negate x2
kitchen finks x 4
Cloudthresher x 2
Wrath of god x 4
Pyroclasm x 1
Mind shatter x 1
Mulldrifter x 4

26 lands- reflecting pools, mystic gate, sunken ruis, flooded, vivids and some islands