Futurist Agent 3U
Creature - Human Ninja (Uncommon)
As long as Futurist Agent is tapped, it's a Human Citizen with power and toughness 1/1 and it can't be blocked. 2U: Untap Futurist Agent. "The Imperials can't arrest you for illegal tech if they don't know you exist."
Ninjas that enable other Ninjas? It's just an unblockable 1/1 that's not a Ninja. Nothing suspicious here.
Great flavor and mechanic. I feel like the base mana cost is high enough that this will be awkward to properly get out and sequence with your ninjas to really make an impact - might need a slightly slower opponent or metagame to get going properly.
This set's Frostpeak Yeti. Probably a little better since you can hit for 3 and still block, but needing to use the ability to get damage in hurts, not to mention that we've already seen a couple cards (Twinshot Sniper, Lethal Exploit) that can snipe this for cheap when it's a human. At 4 mana, it's only a ninjutsu enabler for desperate drafters.