I'm especially interested in cards from the Three Kingdoms, Khans of Tarkir, and the Kamigawa sets. I'm looking through a lot of cards but I feel like I can speed things up with advice from you guys!
If you're willing to go outside of Asian-themed sets, your options get quite a lot better.
Thalakos Seer This guy is the best one I know of. Evasive all the time to empower your Ninjutsu and draws you cards when he leaves play. SWEET. (However, notice he also cannot block.) Gravelgill Duo You're going to be casting (and recasting) creatures...this guy loves that.
I think thesetwo monuments might be worth trying out. There's also thesetwo but honestly, their effects seem not quite worth it to me. The only one I've ever had any luck with was this one paired with Dash creatures, which mostly act like 'red ninjas'. (It's fantastic.)
To be completely honest, I have found Ninjutsu can be quite challenging to pull off. Think about it..they require a constant investment/re-investment of mana every attack to do their thing. You could be spending that mana on doing other things. Your opponents creatures won't usually have that drawback so it's a real tempo tradeoff taken over the course of the entire game. You need to pick up the slack elsewhere (by playing very efficient early-game disruption to even things out) to have a good chance of winning most games.
You can build Ninja in any color but you're going to have the easiest time staying in Blue & Black. Going beyond these colors, you better have a very, very good reason because that adds additional slowness to your deck. That said, here's a reasonably solid Ninja deck in UBR aka "Grixis" colors.
Any card with horsemanship. Flying not as much, but still good.
Ayumi, the Last Visitor - evasive
Dense Canopy - evasion
Fumiko, the Lowblood - If all of your opponent's creatures are tapped from attacking, how can they block?
Godo's Irregulars - this card screams "don't block me"
Kitsune Dawnblade - nasty to block creature
Lure - only enchanted creature will be blocked
Masako the Humorless works will with Fumiko and helps after you just tapped down a bunch of creatures to sneak in your ninjas.
Minamo Sightbender - duh
Mistblade Shinobi+Aqueous Form+Fireshrieker= you shut down your opponent. I know two of those cards aren't from the chosen sets, but Aqueous Form has a sneaky ninja magic vibe to it already and fireshrieker has been reprinted a whole bunch of times.
Roar of Challenge - see Lure
Shinen of Life's Roar - see Lure
Soratami Mirror Guard - evasion
Sun Quan, Lord of Wu - game ender
Taunting challenge - see Lure
Cheap Zodiac creatures that will work well against your meta - evasion
Thalakos Seer This guy is the best one I know of. Evasive all the time to empower your Ninjutsu and draws you cards when he leaves play. SWEET. (However, notice he also cannot block.)
Gravelgill Duo You're going to be casting (and recasting) creatures...this guy loves that.
I think these two monuments might be worth trying out. There's also these two but honestly, their effects seem not quite worth it to me. The only one I've ever had any luck with was this one paired with Dash creatures, which mostly act like 'red ninjas'. (It's fantastic.)
To be completely honest, I have found Ninjutsu can be quite challenging to pull off. Think about it..they require a constant investment/re-investment of mana every attack to do their thing. You could be spending that mana on doing other things. Your opponents creatures won't usually have that drawback so it's a real tempo tradeoff taken over the course of the entire game. You need to pick up the slack elsewhere (by playing very efficient early-game disruption to even things out) to have a good chance of winning most games.
You can build Ninja in any color but you're going to have the easiest time staying in Blue & Black. Going beyond these colors, you better have a very, very good reason because that adds additional slowness to your deck. That said, here's a reasonably solid Ninja deck in UBR aka "Grixis" colors.
Good luck with it!
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Reusable counterspells are broken.