[philipov]

You don't need options. It's best to play around 3 champions for your main position, and 1 or 2 for the other 4 positions. That means you want around 11 champions in your pool. More than that is too difficult to improve with. Let's round that up to 16 champions and give a bit more flexibility and experimentation. This is all you really need, and you will get it very quickly. By the time the meta changes, or you've played it enough to consider changing direction, you'll have more champions unlocked.