Karthus is complete trash right now

As a top 10 karthus in NA. Playing him for 4 years and thousands of games. Karthus is in one of the saddest states I've ever seen. His W nerf may not seem like much but its a REALLY big deal and I've lost out on a lot of kills due to it. With all of these mid laners currently dominating solo queue right now (anivia,LB,zed,fizz,brand) karthus is an insanely low tier champ. Riot, you've honestly created a champion where his only burst is his Q which is INSANELY difficult to hit against any decent players and his R which is too high CD to even matter. Another issue is, that im forced to build Ryalis which is 3.2k item. Im sorry, but if im forced to buy an item to be even remotely threatening in a game then thats complete BS. Honest question, did one of the Rioters get destroyed by a karthus in gold elo? Because Karthus hasnt been relevant since season 2 and there are currently about a dozen karthus players in master/challenger tier in the WORLD. Seriously makes no sense. A lot of people main this guy, and its incredibly sad to see him in uch a sad state. I would love it if Riot nerfed his ult and give him a buff elsewhere.

Please, if youre going to post on here atleast be a karthus player. The amount of dumb comments and ignorant statements made on here by silver players is a tad annoying.