It allows you to cast your skills without clicking, saving you a lot of time and reducing the possibility of misclicking or making a mistake.
Almost every pro player uses it. I've been using it for months now and I'd have a hard time playing without it. It's more useful on some champions than others and some skills are better without it. Good examples are
Ryze or
LeBlanc who pretty much require smartcast to play well.
If you want to use it you have to hold a button by default, but you can bind smartcast + skill to any key you want in the key bindings menu. EG I have smartcast Q skill on Q, smartcast W on W etc.
If you've ever played
Karthus, his
Lay Waste ability is smartcast by default. Most of
Riven's abilities are automatically smartcast too.
Almost every pro player uses it. I've been using it for months now and I'd have a hard time playing without it. It's more useful on some champions than others and some skills are better without it. Good examples are


If you want to use it you have to hold a button by default, but you can bind smartcast + skill to any key you want in the key bindings menu. EG I have smartcast Q skill on Q, smartcast W on W etc.
If you've ever played



Smart-casting improves my gameplay a lot.
It makes it easier to make split-second reactions.
It makes it easier to make split-second reactions.

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Smartcasting works fantastic on combo nukers like Ryze that need to spam their spells or unload a combo very quickly. It makes a lot of your skills just a little bit more responsive, and can make a big difference when you get used to it.
There are some skills that shouldn't be smartcast.
Event Horizon and Finales Funkeln are both abilities that you should pretty much always manually cast. If you need to see the range or placement of an ability before you cast it, don't smartcast the ability.
Change your keybindings each game depending on your champion's kit.
There are some skills that shouldn't be smartcast.

Change your keybindings each game depending on your champion's kit.

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