New Lissandra Passive Idea
Iceborn: Successive spellcasts cause a buildup of ice on Lissandra, increasing her armor/magic resist 3% stacking 3 times. The next spell cast will discharge the ice, costing no mana.
I think this tweak of the current passive will bring a little more depth of play to Lissandra. Currently, her passive is mostly to help with her early game, but really has no use in the lategame. Adding an armor/magic resist buff will give a lategame Lissandra a little more survivability.