User blog comment:Doctursea/Summoner Passives/@comment-4091261-20121027001633/@comment-4893919-20121027221511

Even ignite is universal due to damage and healing debuff. WHen you need to have safer botlane you can pick heal on AD and ignite on support due to higher self heal amount and fact that ignite still deals the same damage, but most of the time heal+exh is even safer.