I played a Bruna list that was similar to the one posted here, except with significantly more mana sources (38 lands + 7 2 drop mana rocks) and a slightly higher counterspell count. I'm not sure how this works with that little mana running around.
It was ok. I ended up taking it apart because it was too swingy; either Bruna got to attack and my opponent immediately lost, or they countered/wrathed/killed her a few times and the other pieces of the deck were not good enough to handle much pressure at all.
I would recommend trying out Tunnel Vision and Traumatize with her though, both dump enough of your deck into the yard that they turn her into a 1 hit kill 95% of the time. Mirror-Mad Phantasm did good work with that too, but was a little slow.
I pulled a Bruna from a fat pack a while back and I have been wanting to build a deck around her so this thread has been great reading for me. After looking over the OP's deck and checking out jylichan's very excellent Bruna primer, I have been testing out Bruna decks in cockatrice this weekend. I have come to conclusion that the 6 CMC is a lie. I need at least 8 before I cast her- 6 to cover her casting cast and 2 more to cast either an enchant like Alexi's Cloak or a counterspell. Otherwise, she won't hang around long enough to swing and and pick up extra auras. In my opinion, she almost plays similar to Avacyn, Angel of Hope developing a mana base while hoping to draw into wraths and removal/counterspells until you can risk casting her. Its an interesting deck, but I think I'll go with a more traditional enchantress route when I sleeve up a voltron deck. I'd like to build a Jenara, Asura of War and use Bruna as graveyard recursion. I'm just waiting for a reprint of Jenara with a less manish face.
So I run Narset and Sigarda.
Narset is a little off the beaten path where as I run a ton of equipment and just smack down people with extra combat and turns.
Sigarda in my opinion is the absolute best. Shes a 5 drop 5/5 with Flying, Hexproof, and stops your opponents from making you sacrifice ANY permanents. Including her. Green is known to ramp like crazy and with green and whites enchantment love you can boost her like nuts. Or if you want to be a jerk basically use white to control the board. I use her alot and she is a really gross commander. I do struggle against Uril decks mainly because I run so many enchantments.