It seems that today heroes condition changes every hour and/or each time I change the order/train them instead of changing once per day! Something's happening that I'm not aware of?
First of all I've got to say that this is enormously addicting game! Good job, guys!
But enough with the appraisal. I would like to draw attention to one flaw that repels a lot of strategy loving players. It's the lack of intelligence (scouting) data that leads to the lack of strategy choices. Now it is limited to the choice of the cards in squads (which is almost always limited to the choice of the rarest cards in collection) and the choice of squads before the battle based on the color of the opposing squads. Attack types can influence your choice of cards only after your defeat when you can see for yourself the details of the counterpart's creatures attacking types.
So my suggestion is adding some strategy choice to the game which can be done by providing more substantial intelligence data - for example the most common attacking type in the opposing squads or smth like that.