All life giver dies is unnecessarily draw aggro, which then kills the mage, making the said mage unable to perform his or her primary role, crowd control and aoe damage. IMO, even horn is relatively useless and the tank I'd better off with a third attack skill because if the mage you are running with does his job right, tanks will have no need to draw aggro and horn only provides a 2 second shield.

Whatever the case, any mage who uses heal in anything harder than elite dead city is not much more than a leech imo and is definitely not someone I will waste time running with again.