but.... it feels like i'm over-extending my deck.... but i really have a fealing that whit cutting the weakest ninja's, adding the best faeries that loves bouncing back my ninja's, and a few changeling that can be both, i might be onto something
It could be worth just throwing in a mystic sanctuary and some number of blue fetchlands in there just so you can, in a bind, yuriko-trigger on the stack, crack fetch, put some big cmc instant/split spell on top of the library to kill someone, or maybe even cast it (say a dig through time)to dig for an answer that happens to be on the battlefield (if you can't kill your opponent there and then).
But htat isn't very budget friendly i guess. Unless you happen to have some nunmber of fetches lying about.
That being said, mystic sanctuary itself isn't all that expensive yet.
Snuff Out seems to fit your theme pretty well. Maybe some equipment would be a good idea. Blue Sun's Zenith or Braingeyser might be a good way to draw your ally some cards if you're doing fine. I think maybe there's too many Sage Owl type cards in the deck with not enough payoff for them, and the Quickling/Faerie Imposter cards seem counter to your strategy of getting your commander in play. Neurok Invisimancer might be a good choice since it pushes your commander through twice.
From actual play Tetsuko Umezawa, Fugitive can do a lot of work with getting your commander and other ninja's through, while the various 1/1 unblockables are great vehicles to get your ninja's in, while cards like crystal shard allow for easy bouncing.