Idea for LoL

This is my friends idea but since i have pbe he thought i might have more influence on rito (i doubt it) but anyway his idea was that if we get mastery rank 5 on a champion that is free to play that we dont own we should get them. i think this is an ok idea but he also had an iea to have challenges that allow us to get extra ip and/or that champion that we can complete thanks for reading :D i hope these ideas are put into place somehow