Unlock all champs in practice tool

Simple as the title says, I think it would be a good addition if riot would let us try out all the champs in practice tool. I'm a solo ranked only kinda guy and I really don't like first timing people, and justing being blind on abilities passives and timings when I go into games + it really helps newer people find champions they like quicker rather than waiting WEEKS for a champion they thought was cool and having their hearts broken (4 years ago it was Kayle she was not what I thought she was).
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