While Corki has a weak laning phase, he will deal more damage to you than a similar champion with mostly AD damage. As champions have a higher base armor than magic resistance, make sure to take magic resist Runes and do your best to prevent him from autoing you.
If you are trading with Corki, be careful of his damage. The 120 base damage, combined with the 8 armor and magic resistance shred at rank 1, make it a deadly ability. However, it has a long cooldown (16 seconds early). Try to trade around this, as it can completely change the tide of a trade.
Corki has high mana costs. If he is spamming his or , he will quickly run out of mana. If he has less than 200 mana, he will not be able to use a full combo.
Work around Corki’s Package as it is an insanely powerful ability that can single handedly change the course of a game. When his Passive is down, he doesn’t have much roaming potential.
Dodge his abilities as they are where most of his early to mid game power lies. Especially try to dodge “The Big One”- Corki’s 3rd missile from his Ultimate: which he gets after 2 uses of his Ultimate. The damage is double that of a normal missile, and if Corki has a completed Infinity Edge- will put out massive damage.
If Corki uses his aggressively or to all in, you can turn on him. He is a ranged champion, and his is his only way of escaping.
At level 6 Corki gets a huge amount of damage from his Ultimate, especially “The Big One”. You can see his available missiles below his HP bar and if you see the empowered one- play safer.
Corki has several large item power spikes. They are when he completes Tri-force, Infinity Edge, and whichever crit item he decides to build. Play around these, as Corki is at his weakest when he’s in between his item power spikes.
Corki is essentially an ADC. If you can get onto him and blow him up consistently, he will be useless all game. For this reason, assassins are very good into Corki, though watch for his spacing. He can very easily turn on you if you mess up your combo.