The best win condition for this type of deck is Akroma, Angel of Fury . Morph her and Flicker her and she comes back face-up, as early as turn 4 with Cloudshift . Look out for good morph creatures in Khans as well. Check out what I did with the deck:

Azorious MORPHine trip

I like the morph idea, I'll definitely be looking out for useful morph cards as spoilers continue being released. But the biggest problem I have with Akroma, Angel of Fury is that I can't interact with her at all once she's turned face up. I have no way to save her with a Cloudshift or Ghostly Flicker if my opponent decides to throw a Doom Blade her way.

Lavinia of the Tenth ?

Lavinia of the Tenth was one of the cards I was looking at when I decided to make this deck, but I feel Stonehorn Dignitary does the job better. I appreciate the suggestion though..

but detaining also includes not being able to block or activate abilities. I mean you could always have both