Also, with running snakes, I'd take out coat for Kondo's Banner, since tribal decks have come back (if they ever left at all) and it can help them as much, if not more. Also, you could take out Autumn and Summer for two more Seshiro. And a play-set of Sosuke summons. If you can unload between 5 and 10 5/5 tokens (Banner on Seshiro) per turn, there's no need for CoA. When at war, it's not how big the soldiers are, it's how many you have and how fast you "recruit". I will post my deck ASAP.
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I play a similar deck, but i include Shisato - Whispering hunter, Tangle Asp, Lure, and Nature's Will for a mana lock. Tangle Asp is a little better than Ohran since it destroys anything in combat with it. Attach Lure and you've almost always have a field clear. With enough tokens, this combo (Asp and Lure) will win the game if not prevented.