Shin needs a nerf
Well, the effect of his special. See, I don't think he's BROKEN broken, just overtune. Almost every leader's special have a side effect. This includes attack boost, increase speed, healing and as well energy regen. Shin is the only leader in the whole game that affects another leader's energy bar. Get hit cause you to lose 4 bars. That's a considerable amount since the max is 10. The problem came mainly from his buffs, a decrease to both cooldown and cost. This is why he is so rampant now. To make matters worse, there are two battle cards that also decrease the special cooldown time. This cost nothing but spam, allowing a simple special to break the game. I find Monster Zero more balanced than Shin. The best way to nerf him is either increase the cooldown or reduced the energy loss to 2 or 3. Again, I don't think he's broken, just an oversight from the developers because they clearly want him to be used more, just didn't considered the affect of his special.