Seems like Archangel will be tough to cast. I think you're undervaluing Hixus, i would switch a Winnower with him.
I think you could use a couple copies of that enchantment fetching white dude. You could also use a couple of Suppression Bonds as well. Not really understanding Deadbridge Shaman here, especially that you're not playing any bone splinters. No Languish either which I guess makes sense. I sure hate Reprisal here.
...no fleshbags or Liliana either...
when you're trying combo stuff like enchantments, you need some draw. Maybe find room for Read them Bones
Assuming you're talking about White Knights, there are 19 W sources and 2 KotWO so it's very easy to get it on turn 4, although my turn 4 is usually best used to enchant, play 2 creatures, or drop Irregulars.
The 3 CMC slot is the oddest part for me; the Deadbridge Shamans were in the current build because they deal better with other aggro/midrange decks than Fleshbags, which were originally in the list. That is the one place where variety is up to the user. Languish is bad because the majority of the time you'd be wiping more of your own creatures than your opponents, and then get wrecked when they drop a high CMC bomb. Liliana is similar; run it in that slot if you want, maybe with a complementary Fleshbag, if that suits your fancy.
You need reprisals; if you play my build without them, you'll quickly understand why.
I guess you do have a valid point with Hixus, though; I might try out dropping 1 (or both) Winnower for that. But if I do, then I have a different problem in the forms of Disciple of the Ring and Soulblade Jinn, neither of whom need to declare attacks in order to provide value (although, I should mention that these two are lesser concerns, due to rarities and their seeing little play).
Read the Bones could go in the 3 CMC slot in place of Deadbridges (I will test it out), especially since it makes use of the lifegain. However, in principle, if it doesn't improve the deck much if at all, then these should be avoided, as the turn you play them should be used advancing your board or buffing creatures (or tapping with Irregulars).
I hope I addressed all your concerns. I will report again after I test the aforementioned changes (and invite you to test the deck as well). Keeping in mind that this is aggro, not midrange or combo; we gotta turn em sideways or get out!