So currently my blizzard is level 18 and says that it uses 3800 mp per use, but that being said even though i have 5000+ mp it states that I do not have enough mp for this skill. For blizzard to work I have to have about 8000 or more mp.
Elemental amplification is bugged for I/L mages atm : You need to have the 7-8k mana to be able to cast it, but it consumes 3.5-4k mana. That being said, there was already a thread about this not too long ago.