Let's bring back Team Builder!!!!!!
Pls, I just wanted to express this. I can't stand having no realistic avenue to practice champs. I don't care about ten minute queues, just let me play the same champ like 300 games in a row 
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"10 min queues" if only it was that little. Unless you were support your queue times could easily reach over 20 mins. Also you might be ok with high queue times but most people won't
You do have a place to practice champions. The Practice Tool allows you to practice all of your abilities on very short cooldown. Nexus Blitz allows you to practice your champion in quick bursts of teamfight play, the games themselves not lasting overly long allows you to test a multitude of different team comps with your champion. I'm currently using Nexus Blitz to practice Aatrox
they could just bring back teambuilder as a separate game mode.. like a non-ranked casual thing..