Lissandra new passive idea

So lissandra her passive right now seems very useless and doesnt have any impact in the game. I have two concepts first one is this: If lissandra has less than 50% mana the mana cost are reduced by 50%. Her spells do magic damage 20 / 45 / 80 / 140 (+15%AP). Let me know what you you think tho the second concept i think its better. Lissandra start the game 5% increased mana. For each unique champion kill or assist she gains 10% bonus mana. Her spells do 8% bonus magic damage based on her total mana. Lissandra is an ice mage and i always think ice abilities must hurt enemies since her ult does not do much damage. Anyways tell me what you think!!
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