It seems like Shattergang Brothers or Prossh, Skyraider of Kher would be better, because unless you are facing another dragon deck, karrthus doesn't seem very good for the deck you play. Shattergang for extra control, and Prossh for that big huge swing out.

actually come to think about Kresh the Bloodbraided would be great for your deck, you have so much removal

thenotcher: Well, I thought about all of these options actually. However, I still think that Karrthus is an ideal commander for this kind of deck.
He has haste and flying after all - immediate 7 cmdr dmg is pretty awesome.

I can concentrate on killing pretty much everything first several turns and then pull Karrthus and then again and then again... However, Karrthus's main disadvantage is pretty obvious - copying it. And/or countering it. There is Cavern of Souls and will be included in a future build, it's not enough though.

This deck has a serious trouble while playing against Geist of Saint Traft kind of decks. It just sucks against U or U/W controls or fast combos ( but that matchup has been improved since a lot of instant removal cards have been included )... Therefore it's the main goal I would like to accomplish as for now. Get more U control competitive and stay Jund fresh mint awesome.

Still, thanks very much for your comments, I very appreciate your suggestions. Maybe you know some tricks against heavy controls/combos in Jund colors?

If is really enough of a problem, and it is appearing frequently for you, consider Choke. If it resolves you pretty much win against mono unless they draw a Venser to bounce it.

Also to stop combo decks, especially extra turn ones, consider Stranglehold.

2x Restore in your decklist

Devix: Hi, it seems to be twice in the decklist but that is just because Restore has two tags.

kengiczar: Thanks for suggestions! I did think about them earlier and now again. However, both of them could use Cycling ability to be more flexible :) But just as you said - in EDH deck building majorly depends on the playing group, so I will think about this after our next play-group meeting.