Looking for my next champion

Hi, I am looking for a new mid lane champion. I currently main and my friends say that if I win lane then I dominate, and I asked what champions scale super hard in mid lane and they said that I main him right now. I am here to ask what champion, preferable a mage please, that is super hard to shut down late game. As a second part if you know a champion that fits the mentioned criteria and also has alot of cc with alot of damage, but this is just a bonus no need to pay attention to this if you don't know. Other champs that I own are , , , and if this helps. They are champs that I own that I think might scale hard (maybe not Malzahar though). If you know multiple champions that scale hard then please say all of them. I was also recommended just now to try , , and before Riot removed it for not being under gameplay. Thanks ♪~ ᕕ(ᐛ)ᕗ