Corki Base Mana
Corki's level 18 mana is 858 (one of the lowest in the game) yet his Q and W cost 100. What?!
[zombie-nunu-bummed]
I get that we don't want him to spam his Q all day and be oppressive but these costs are super punishing on a champion which isn't supposed to buy a Tear. :D A good way to avoid the oppressive laning situation while still making his mana costs feel more reasonable is to up the level 18 scaling to reach ~1000. This isn't even that unusual. Ezreal has 1075 and still builds a ton of mana. AP champions have even higher bases and often buy mana items as well. Kassadin's mana at 18 is 1537. The way Corki plays is actually a lot like AP champions or Ezreal. He's more a spellcaster than traditional ADC so he needs to have either less punishing mana costs on Q/W or a larger base mana. A larger base mana is the safest way to mitigate these issues.
and it was k
I'll put you... in my book!
Problem solved, I'll take $50 to my Paypal or a BJ
he isnt an auto attacker he needs mana and cdr to spam his rockets and q

it dont matter. he still needs the two items completion by mid game to his his power spike in whatever combo you want with
all of these Ap's have empowered auto attacks and are encouraged to trade with them as additional sources of damage.