Mages need more options to itemize against ADs
I'd be happy if you guys would give your reasons for downvotes. Otherwise it kinda feels like weak. It took me a while to write this thread. Be so nice and don't trash it for whatever reasons. EDIT: we got downvoting troll onboard. Unless.. it's my personal hateful stalker.
ADs have:
->
->
(even this could be used
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That totals to 95 MR along with very usefull perks (135 with wits end).
While mages have just old & nerfed 
Just this one item with only 45 armor. Has low amount of AP, compared to AD counterparts. On top of that it's active was nerfed for only god knows what reason
I know mages could buy randuins or frozen heart, but it's kind of counterintuitive to play mage yet build mild-damage tank, while AD becomes natural tank with some serious power under that thick magic armor for no reason.
There was idea of introducing Moonflair Spellblade, but tbh i'm shivering on just a though of tanky-AP-divers like Diana buying it (btw what's the point to play Akali, if Diana does her job 10 times better and actually kills & survives?).
Here are my few ideas (for some numbers lets say mages will get 600 AP max per game. That's reasonable, isn't it?): Remember old Xeraths passive? He gets armor for %AP he has. In lategame with around 700 AP he'd get around 80-90 armor from passive alone.
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Item: Old Xeraths Guts 30 AP 15% of your AP converts to ARMOR (90 armor) 5% of your AP converts to Magic Resistance (30 mr) Active: You can lock a target which will deal 20% less damage to you for 3 seconds. CD: 60-90s (Something like Phantom Dancer, but less broken) Price: I dunno, figure that out yourself
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Introduce mastery: 10% of bonus AD converts to MR 10% of AP converts to armor (there could be also HP->Mana/Mana->HP conversion passive) Anyways, numbers have to be really meaningfull.
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Rework Zhonya: Add alot more armor. 90-100 or even more. Gut Ap to something silly 20-30 Remove CDR, cause it's pointless there. Active: CD return to 90s
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Or if you don't want to rework Zhonya, add stacking mechanism on active, where whenever Zhonya is used her CD permanently reduces by 2-3s and adds tiny bit of armor (like 3-4 armor per use) But seriously, Zhyona needs more armor. Alot more. OR AT LEAST make this armor count NOT as a bonus armor.
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This is probably the most proper way, yet most difficult: Remove powercreep lingering on AD itemization. That also means reverting armor & survivablity-related nerfs for non ADs
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Item: Gankplanks phantom Keg of true damage Some Ap, 40-60 Some armor, 30-50 Some HP, 200-300 Active: For 2 seconds you deal only 10% damage, but you also receive only 10% of damage. Can pass trough minions. CD: 90-120s Active CD reduces by 5 seconds whenever you lose more than 10-20% of you max HP in 1 second
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Item: Alistars manly breasts Note: You can't milk those Some Hp 200-300 Some Mana 200-400 Some Armor 30-50 Passive: After taking 30-40% of your max HP under x seconds relase cleansing wave removing CC from you and reduce incoming damage by 30% for x seconds. CD 90s. CD is reduced by 1s per enemy minion/summon killed. Enemy champions take 3s off CD.
is an excellent anti AD item for mages

( Picking out common ones i see )