Looking for a mage to play mid lane with

I main Top and jung, with support when needed. Champs I play most frequently would be my main Pantheon top and jung, Cho top, malphite top; blitz, thresh, raka support, and Udyr jung. As for the carry roles mid and ADC, I only play those if it's absolutely necessary, when I do I go heimer or ziggs mid, and Jinx or Caitlyn ADC.

As the title says who would you recommend for a mid laner, in my experience with heim he's either really good or really bad, you either get to lane get setup and push the enemy to their tower, or you are countered they destroy your turrets as you place them, and force you under tower, and I'm just garbage with Ziggs, bought him shortly after I started playing a little over a year ago, and was ok with him back then but after I took a break during last season I come back towards the end and found he's either not that great in the meta or I am really garbage with him. With what I play a lot of, I would say I'm looking for a mage that isn't as squishy as most, or an assassin, but after the assassin nerfs in January they really rely on getting fed early. I was thinking a Mordekaiser or Vlad mid, they don't have many skillshots so they fit in with what I do have, and they build more AP fighter than just straight full AP.