why has my winrate with karthus skyrocketed
So I am karthus main with 340k points on him and I used to have a 50% win rate with him in norms(I do not played ranked) and now I have a 60% win rate with him. I play him top and mid and just destroy now. I cant think of anything that would of changed his match ups in fact I can fight almost everyone top lane now really easily. Its not that I am better at him than I used to be my friend who is also a karthus main has also experienced this win rate rise. I'm not saying this is a bad thing im just wondering why what changed so much that has allowed me to get a much better win rate as karthus.