Items cover pretty much every mage, I can't honestly think of a mage who can't get by after building an Athene's, which is more expensive now. Doran's ring is now based off of Base mana, which I might add, Lissandra has the 2nd lowest base mana regen, and ties most Marksmen in Second Lowest Mana regen growth in the game. The reason her mana regen is low is because she has a mana passive mind you, but by design, not even by underrating, Lissandra's passive is the worst designed ability to serve that function.
's passive is underrated, 
's is literally bad design. Iceborne encourages Lissandra to spam her spells in order to keep its uptime to a reasonable amount, Keep in mind that Iceborne has an 18s Static cooldown, that is reduced by inflicting crowd control with her abilities. Her Q, which is her most useful harassment/farming tool, and as the spell you'll be throwing the most often, with its fairly low cooldown, has a rather hefty 85 mana cost. At level 1, Lissandra can afford to cast her Q 4 times with her passive before running out of mana on a spell with a 6s base cooldown, a spammable spell that feeds into her passive...ONCE. Out of that 18s, you get 1s off for spending a significant portion of your mana pool, on just your basic harassment tool. The only spell she has that is even close to "mana efficient" for her passive is her W, which is the only spell she has outside her ultimate that feeds into her passive more than once. Hell, at max rank, her E, which is her signature engage/disengage tool, costs just as much mana as her ultimate, and doesn't feed into her passive at all.- Comparatively, let's look at some mana passives that DO work.
has the closest resemblance to Lissandra's and allows him to use free spells once every 5 basic attacks. It doesn't interrupt his play, nor does it require he spend mana to make it work. He auto's to charge, then uses an ability for the new cost.
has a static cooldown of 12s, and procs by auto-attacking an enemy target, and doubling its gain by autoing an enemy champion. again, Xerath is not required to use his mana to gain it, and his passive is even user friendly in the form of not proccing if he wouldn't gain mana from the auto anyway.
has Mana Font as a passive. Nuff said.
The deal with 's passive being bad isn't the fact that having a free spell every so often is nifty, but rather the fact that to make her passive come up in enough time to make it worth it, she's forced to expend what little mana she has, often resulting in her going out of mana rather quickly (and that's playing conservatively). If your plan is to make someone have more efficient casting, which Iceborne is trying to do by giving free spells, then those points need to be effective. Lissandra has to spam her spells to get off harass through minion waves due to her Qs horrible base range, is necessary to keep her lane pushed. Later on in the game, Mana isn't usually an issue for most mages, as we have to buy some form of mana sustain in general, and the types of changes made right now, are the kinds of mana changes that affect the early game, where mages have the roughest time keeping up (Especially when faced with energy or non-resource champions who can spam for little to no consequence).
Now i'm not asking that riot buff Lissandra into being beast-mode again. But if they're going to do small passes over champions who have significant early mana problems, then there's no major reason i see as to why Lissandra can't be one of them. At the very least it would be nice to have a word on whether or not her passive is being looked at. Because it doesn't work well with her kit. Free spells work best when you have high fidelity skills that you can use them on, Lissandra's best option here being her Ult. Unfortunately due to her kit encouraging, and at points requiring spam (as utility mages must widdle opponent's down before they can burst), What happens by and large is that her passive is wasted on a Q or W, and by the time its right for her to go in, she's still paying full price for the skills she wants to use her passive for, which is her E and R. A passive that either better encourages her to make better use of her crowd control, or just helps her out since her entire kit is designed to get her up and close to the enemy team, an incredibly dangerous position for a mage to be in, mitigated by Zhonya's and her self-ult but costing her spell efficiency would be much better. Or at least making it so that her choice of free spell were more noticable, or required her to pass through fewer hoops to make use of.
I know how annoying it is for people to harp on things that aren't that bad, but this is a case where full-on, her passive just isn't optimized for her kit, and even antithetical at times. Its not about whining, its about good design, and Iceborne, just doesn't have that.
