First off, I will say that this is neat. It's an interesting take on healing blight, and how we'd do it. But I'm left asking myself over and over, why? Why do we need a revision to blight healing, when plenty of people are happy with the way we currently do it? Sure it may not be the most popping and in your face sort of way to heal blight, but it works, and plenty of us have fun with it. In a lot of ways, this seems to make individual blight healers a bit weaker, unless I'm misinterpreting something here.
I want weather control in some way to come back, I really do. But if we're going to change a subtype to fit around it, I don't think blight healing is the subtype to change.
Apologies if I'm not getting my thoughts across quite clearly here... Hopefully what I'm trying to say is getting across alright.