User blog comment:TMek7/Alistar (Alternative)/@comment-24170465-20140316211251

Basing completely on health would not be amazing, I feel some people would like it, but it would also mean he would not have to decide between being unkillable and dealing massive damage. That breaks the concept of building. The passive seems nice for a second until you consider how terrible that would be in the middle of a teamfight or even a large amount of ranged minions. Alistar could die easily and very quickly unless he immediately ulted.