A black mage skill like that might cause some issues considering the fact a white mage can heal themselves or use regen. An attack style spell would at least require some strategic planning thinking when to best use it.

AS for the ideas for Reraise, I can agree with longer cool down, but the other bits make it a little complicated. White Mages are already pressed for MP. Taking off 700+ in a big battle before it even starts is a big handicap. The only one thing would be halted by the fact the long cool down would make putting it on everyone a waste of time(or with the cool down 10 minutes, give them no time left.). Stacking it one person would not be a issue either when you look at stoneskin and protect. It's the equivilent of 1 free swift cast raise a boss fight. Not a huge advantage, but it would make having a white mage with you a boon rather than a lesser Scholar.