Magic Resist item for Long Range mages ^.^ Upvote meh!
((I put a lot of effort into this, even calculating the gold efficiency and making the item cost correct, so please read before you downvote, ty friend!)
Hello, I'm Dulu - currently Platinum 5 (and climbing) in solo queu. I main midlane, normally Lux, Ziggs, Twisted Fate. I love my mages.
Currently, your itemization for an AP mage looks like this:
or
or
or
or
(and then the other)

So really, you only have two "choices", and they're kind of made for you depending on your champion and the enemy champions. There are a few other items you may sub in and out, like
or
, but for the most part, your build is going to be the pattern I listed above.
If you look over these items, you'll notice one pretty important stat is missing. Magic Resist. Yes, there is the paltry MR from
, but that's simply not enough lategame in the current meta where Viktor and Ahri can accidentally kill you with an errant Q.
isn't ideal on many mages due to its very short range of effectiveness.
I propose the following item:
1250
+
1200
100 AP 50 MR 300 Health Unique Passive: Grants 150% Base Health Regeneration after taking damage from an enemy champion. Unique Passive: Regrowth: When dropping below 30% Health, you replenish 15% of your maximum health instantly. (120 second cooldown) 3,000 Gold
This item becomes a "Zhonya's Hourglass" against AP users. The unique passive acting as a "Cheat Death" effect, replacing the "Immunity" effect from Zhonya's.