Best things about 5.18 imo

Having his duo lane nerfed down to bring his top lane power up to speed is what I think is best for Mordekaiser. Bot lane was never intended to suit him anyway. We're pretty much done fighting against a duo bot with infinite Relic Shield sustain.

Every top main's favourite nerf. This should put a stop to his sustain pressure with his Q, plus having a scaling mana cost again will have Darius players think twice before spamming it for pokes/heals.

Ahhh my main top laner. I used to have problems of accidentally hitting a movement command with my right click RIGHT AFTER I hit my ult. This can be very distressing, as I could have lost the battle with an unnecessary accident. I guess 0.25 seconds is long enough to prevents accident like this, 0.5 would have been better doe.
Reform Cards in-client
After Patch 5.18 kicks in and you come into Boards, you see a "I dont deserve this permaban/suspension" thread with no chat logs, just don't believe him & downvote him. He was honestly toxic in any way since he's too shameful to post his chat logs in. Either that, or the guy's next excuse would be "I cant log in to see my chat logs, keeps saying Unknown Error".
And last of all:
Worlds Championship 2015
I'm prepared for this moment. Cheering for C9! :D
What's your best thing about Patch 5.18?