Unfortunately, 6 mana is a huge ask for an initial casting of this commander, but that should provide ample time to pad your life total, giving you more fuel to grow your army once the right time arrives
Here's two ways he'll appear in Kamigawa: Neon Dynasty boosters (and one more you'll find on the official Japanese Magic Twitter account later today), including the unique ninja frame treatment: We begin Kaito's story when he is just 16 years old, journeying in his duty to track down a mysterious metal-armed man who attacked the emperor of Kamigawa
Ruhan's only loyalty was to his own personal code, for it had transformed him into something greater than anyone could've ever foreseen
On second thought, that sounds a lot worse than Genesis Hydra, but I still think it looks like a sweet graveyard/ramp payoff
2013-01-24 The number of cards you draw equals Prime Speaker Zegana's power when the last ability resolves
Your creatures won't get more powerful if more than one artifact entered the battlefield under your control this turn