Changing summoners spells at the start of the match?

I've done it. You've done it. We all have messed up our summoner spells at least once. The worst of them, forgetting to take smite. So I had an Idea. Why not, when you first enter the came you should be able to change SSs. it should work like howling abyss where after you leave the shop for a certain amount of time you can't buy anymore. I just felt this could be a nice change to leauge.
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