The mechanic sounds more Magic the Gathering than Battleground, but I must say that something along those lines does strike me as intriguing.
That is true, but this just the core mechanic without the fluff description (other than the special ability title "flexible leadership"). Many cards would lose their nuance if reduced to the description of the mechanic.
Also, I was just spitballing, the final product wouldn't have to be very closely linked to this outline.