i think volibear has huge teamfight potential, more than his 1 on 1 potential... although his passive is VERRRRRY strong. if played right in a team fight... he can decimate with his executions, since you have teammates to do the initial damage so you get the bonus from missing health, and his health and passive gives him great survivability to facilitate the whole process. if anything i would say his passive might get nerfed a tiny bit (maybe make him heal the damage over more time), but i think he is very strong.. wont say OP but very strong. basic recap, good initiate for team fight, tanking potential from hp build that helps his ability scale, devastating execution damage, and a passive that gives him even more survivability. i will say this much, definitely gonna buy him if they dont nerf next patch.