UM value...it has been one of the WORST passives in the game since release...
It doesn't provide ANYTHING when your mana costs are outrageous anyways.
THE ONLY thing I find this good for is when you blow everything in a combo and you wait a few seconds for that free spell to get the mana for her escape.
They need to give back the Ratios and bases on W if they are going through with this garbage. OR rework her passive.
Something like :
Ice Queen: 5% Damage received restored as Mana. When reduced below 20% Health OR Mana Lissandra Deals 5% more Damage. (Not exact numbers but interesting non the less, kinda like old Karma."Ice Queen" as a buff seems relentless in name too)
This would allow her High mana costs to be justifiable.