User blog comment:CrashySmashy/What else if not new champs?/@comment-79.175.77.199-20120904214134/@comment-31.23.216.215-20120906081723

''Practice mode in wich you have all the champions available and in which you can try builds, you have unlimited gold and all the runes available, you can play it with friends or you can play it alone to test your builds or ideas. Something like a sandbox for practice.''

We already have PBE for that, actually.