Reincarnation - You are realitivly immune to death. As long as you do not get killed again withing a couple of minutes you are immortal. Sadly it is unclear whether this ability prevents death due to old age.
Divine Shield - You are completly invincible for a period of time to any form of damage. Be it nukes, bombs, guns, artillery, meteors, supernovas, you can take it all without a scratch. Down side is it lasts for less than a minute but can be reactivated a dozen odd seconds after expiring so aslong as you have mana you can not be harmed.
Resurrection - Keep everyone you love alive forever. Every few minutes you can resurrect 6 people who have died. Problem is it is an entirly selfless ability and will not help you live better. You could however live very well with such a skill.
Charm - Control whoever you want whenever you want forever. You can charm every few minutes and the effect is permanent. As the target is left unharmed physically and the effects are not very noticable you could easilly pull this off on the rich and powerful. World domination, world peace, unlimited wealth, this move has them all. Again though this move will not help you actually survive and also might be wierd if your a male.
Farsight - Not actually benificial directly but would be fun. Wanted to know what someone is up to, you can just use and find out. Global range, cheap cost, low cooldown, what is not good about this. Need those answers for your exame? 1 cast and the answersheet is revealed and no one is none the wiser. Could obviously be used to blackmail but that is mean.
Demon portal - Summon demons every few minutes. Prety lame and less fear striking than rain of chaos in destructive power with exception of a small detail. The demons summoned are forever yours to control! The cooldown is also not too long considering the firepower it brings you each cast. Camp out in the wilds for a few days and you will have legions of demonic troops at your service. World domination is will follow. Even if you are not agressive, it means free servants and bodygaurds. Infact, for a good person it could make humans live as god with demon slaves to do everything.
Transmutate - Converts a person into gold. Killing is not nice, but this move has a secret up its sleave. Due to the energy needed to carry out such a conversion being generated from nowhere, it is likly to end existance immediatly and uterlly. Better blackmail options are not possible. I guess you could use it on near dead people to make a memorial for them if for some reason the unvierse does not end. Using it on doomed animals is probably a good way to devaluate gold and give them a humane death.