You have a lot of good pieces, but literally NO answer to opposing threats.
Path to Exile strikes me as a very important piece.
Given the aggro nature of what you have, I would suggest dropping Elesh Norn, dropping
Hero of Bladehold to 2x and moving
Kinsbaile Cavalier up to 4x as giving ALL your creatures double-strike is more important than pumping out tokens.
Perhaps
Adaptive Automaton could serve you well... might as well pump things while you can. The only other hole I can think is the lack of any card draw (typically a challenge in most colors outside of blue). As you're going to dump your hand quickly, you'll end up top-decking a lot... some of these knights aren't exactly the bombs you would want to draw beyond turn four or five.