Buffed Heal Spell

My basic idea for this is the heal spell will now have an exponential growth in it hp healed, so it will start with something around the normal healing, and then every couple seconds it will increase about 10-20% healing based on the level of heal spell. I think that this will help the heal spell keep higher hitpoint troops like dragons or pekkas alive in higher level attacks. It could also be incorporated into town hall 10 three star attempts so that you could try to keep your kill squad alive longer so that you can get those inferno/s and air defenses down. They should also take away the effect that inferno towers negate heal spells, it completely takes hog riders out of the picture and it makes heal spells useless, inferno towers are already op enough. I think this new heal spell will help dragon attacks and it will make town hall 10 3 stars not impossible.(sorry that this isn't really organized I just wanted to get the idea across)