So a combination nuke machine and heal machine? That's... Probably not doable in a way that doesn't make both sides mediocre at best.
In pathfinder at least, Clerics tend to be more geared towards melee combat, and using a lot of self buffs and utility spells. Their healing isn't particularily spectacular due to inability to match or outpace damage, meaning you prevent more damage in the long run by killing the enemy faster than trying to be reactive. They're powerful, but healing is more of an after thought for them.
The Vitalist may be the closest one can get to what you want. They're a psionic healing class who can clone their healing spells onto several allies and can provide massive temp hp boosts, effectively overhealing allies. As psionic characters they can get other psionic classes spells via feats, so it's possible to pick up powers like Energy Blast.
They're nicest trick is the ability to reallocate healing. Say you're linked to two people. One too 5 damage, the other took 4. The one who took 5 drinks a healing potion, and heals himself for 6. Normally that extra 1 is wasted. But a vitalist can instead divide the healing up. He can give the person 5 and give the other injured person the remaining 1, or can give both 3 or etc. This makes AOE heals like Channel Energy from the Clerics actually useful as you can avoid wasted healing energies. And it can allow Paladins ability to swiftly heal themselves to also be used to heal allies on the fly.
They are not suited at all to physical combat at all though, unlike Clerics.
