Quick Siphon (morph of Force Siphon, last skill in resto line) gives you and your allies health when you attack the NPC it's been cast on. It lasts for 20 seconds and is cast instantly. Spirit Siphon works as well, and it restores Magicka on attack, but it has a cast time. You can use this in addition to Degeneration and get some nice healing. I don't know the math sorry, I just know from my experience it works well.
Does this game bring out the rage quitter in you?