So some of the cards that stick out immediately are:
Exclude: I don't see why countering creatures is that important. You don't actually need all that many counterspells, so we can also remove
Abjure,
Dissolve, and
Familiar's Ruse.
Man-o'-War,
Faerie Impostor,
Quickling,
Cunning Evasion: I'm not sure how important returning creatures to your hand is. While lots of them have enter the battlefield abilities, I think you would rather have more creatures on the battlefield, to get more ninjutsu opportunities, or more card draw.
Vampire Cutthroat,
Phantom Ninja: There are better unblockable creatures, most of which you already have.
Connive // Concoct: Neither one of these effects are worth the mana cost.
Curse of the Cabal: This card is only really good for it's damage with Yuriko. There are better cards you can run for that.
Make some changes and let me know how it goes.