I don't think Speed is overpowered, it's not like you get another full move. It generally allows you to move 1 or 2 extra hexes. As the duration of attacks depend on AP's, it's not a powerful offensive tool either because if you can attack again using it, it will be a short fight.
Your right, i guess i used the wrong terminology. I dont really think its overpowered, as much as it is a little cheese, with resigning units to an hq to play another card on them, i know it lowers readiness. But it seems when you reassign a unit you shouldn't be able to play any cards on it the first turn of reassignment. Or something like that. I do however find myself using the speed card more than any other card though. Because the nature of the game outmaneuvering is the way to go over fighting.
I dont know if requiring a delay for the card to be played a round is good, because it might be hard to remember which units you played the card on. If there was a unit marker that could highlight units with active speed or other bonus' than i dont think it would be a terrible idea, because it would increase the strategic planning. But other than that it might be more annoying.
I am considering making it impossible for any HQ to play any cards after you assign new units to it.
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