Support Kayle 0-18-12 Masteries seems pretty legit..on paper how is it really?

With the utility masteries buffing heals, cooldown reduction, and summoner spell cooldown this might actually be the thing to make support kayle pretty good.

Having a targetable invincibility is just icing on the cake. Heal summoner spell got indirectly buffed as did healing in general with the nerf of grievous wounds.

I'm going to try this out and see if it pans out as well as it looks. I've already tested the difference between no masteries and both heal buffing masteries (0 AP with both) and the difference with W (divine blessing) at level 1 is roughly 10 hp of health from 60-71. With the heal summoner spell it is 18 health from 90-108 approximately. These are all self-cast.

W already gives a speed boost but now it can give resistances as well with these masteries. I'm wondering if the new would work on her. to supplement her ap

Thoughts?