I have not read the other suggestions, so sorry if I accidentally make something that you already got. I just want to help.
1: Circle of Life
Summon a circle at a target area for 3 seconds. At the end, all allies in it are healed for an amount depending on how much time spend in the circle.
2: Mass Drain
Channel for 3 seconds and drain life from each nearby enemy within range. At the end, all enemies still left in the area will have that amount they were drained taken as damage and each restoring that amount to the caster.
3: Holy Interception
The caster jumps to an ally, causing him and nearby allies to restore health and leaving nearby enemies stunned.
4: Bond of Healing
Sacrifice an amount of health to heal a target ally for an increased amount over time. At the end the Caster will be healed for that increased amount as well. Moving too far from each other will break the bond, canceling both healing effects.
5: Death Pact
Sacrifice yourself, leaving you uninterruptible and invulnerable, while your soul rapidly heals a target ally for a duration. Upon ending, the soul will return to your corpse, reviving you.
6: Well of Replenish
Create a well at a target area for a duration, healing both allies and enemies who are nearby over time.
7: Bathing Touch
Heal a target ally. The closer to the ally, the more efficient the heal.
8: Raise Morale
Increase the maximum health of a target ally for a duration. At the end, heal nearby allies for the bonus maximum health preserved by the unit.
(Say if a Footman has 420 Hp and gains the buff of +200 Hp, he will have a total of 620 Hp. If he takes damage and remains at say 520 HP and the duration ends, he will have a total of +100 bonus health at this point. He will then restore 100 HP to nearby allies and have his bonus maximum health removed. If he takes damage which will leave him at 420 HP or below, the end effect is canceled. Somehow possible with the 'Avatar' ability maybe?)
9: Freezing Preservation
Freeze a target ally in ice, making it unable to move or take action for a duration. The target is healed over time and will take decreased damage from enemies.
10: Avenge
Choose an ally to become companions. If either of you die, fully restore the other companions health and mana, and give it increased damage.
11: Thunder Clap
The caster starts channeling, leaving pulses of slowing effects to enemies in the area. The terrain will start crumbling and collapse upon the caster, dragging all enemies to it while healing it for every enemy affected.