Champion trial

im sure people have had this idea before, but i just thought of this. I thought it would be cool if Riot added a feature that would let you try out a champion for a few games. For free or say 3 games costed 350 IP, that would be kinda cool to be able to try out a champion you were interested in before spending all of your IP on someone you dont like. Say i only had 3000 ip, and i was grinding to get 4800 and i wanted to try out Nocturne, i could pay 350 ip to try him out for 3 games or so and if i liked him i could continue trying to get enough IP for the actual champion. Everyone knows you could get a lucky game and have a very good game, and some other down sides. So in a way the 3 games gave you a visual of different encounters you will find across the rift. I dont know i just thought this would be a good idea, Give feedback on thoughts