Really like how you've toyed with the fundamental element of chance within root, and then built up on that with the wagering and battling mechanic. Really cool! I think this one specifically I would need to playtest in order to see how each component and idea works together to the benefit of each faction.
I think if you want to dedicate more board space to your actions or rules, I don't think you need an outlined space on the board for the coin. Up to you though as it's totally a matter of opinion. Great submission!