what about your two changelings (all creature types) and a deck full of abilities that make any creature anything you want (including knights). on that same note, Griffin Rider might be an interesting addition.
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I would put a few kinsbaile cavaliers in and your opponents will be dead a lot faster.
I use wall of denial in my deck that looks similar to yours but I use +1/+1 counters and graft. the cool thing about graft is it doesn't target so you can use it on the wall. check it out and let me know what you think. http://www.mtgvault.com/ViewDeck.aspx?DeckID=333377