What if Lissandra's Passive could be lowered by CD reduction?
This seems like a nice late game minor buff that could help her become a little more popular and viable. Her win rate and play rate have been a little below average for a while even though I think that her lane phase is fairly healthy. Part of her problem is that you have to build CDR, mana, tankiness and AP somehow with her (most pure glass cannon builds don't suit her playstyle very well imo). By allowing her passive to be influenced by CDR, you can focus less on buying raw mana or mana regen and itemize better for late game where she isn't the strongest mage. This seems like a buff that wouldn't make her very overpowered because the most it would be giving her is a bit more mana 15+ minutes into the game.
Ideally,
could just be given a new passive altogether and not just be stuck with one that gives her more mana just to offset her high mana costs. This would probably be a better long term solution for her but I think my first suggestion would be effective in the short term.
being built. Like give her a passive that increases her output if you hard cc them or something.