What champion is the hardest to smartcast everything on?

Diana's Q can be tricky with smart cast on. I personally have smart cast on every champion because I feel it's much, much faster. It's awkward at first but after a while you get used to it and I can always hold down alt if I want to non smart cast a spell.

I only use smart cast on champions after I learn their ability range and you should do the same. I dont know if there is the harder champion to smartcast on, but champions like or can be hard to use with smartcast, because of their walls that are crucial to put them corect, otherwise, for example, with Anivia you can catch your teammate in a bad situation.

1Mostly champs with abilities like Q , E, R, W. Etc And ofcourse champs that you have drag lines like E or R.

I think Sion still doesn't interact well with smart cast, but I could be wrong. Veigar's Event Horizon is probably a bit wonky unless you know the distance from the center of the stun very well.

Viktor