Idea for the Champion Masteries system

Alright so I had an idea for the future possible things you can earn when earning champion masteries. If anybody has ever played Hearthstone, they will understand what I mean. So when you play/win (not sure) 500 ranked games with a certain class, you gain the golden border and there's animation on your hero. The principle of my idea is basically the same: When you get to a certain mastery level with a champion, you would be able to have animation on him/her in the loading screen. I know people would love to show their favorite champs this way and have something more special that links players with them. Of course that would be a lot of work for Riot, but I know people would be proud of the animation. Now of course there are skins and animations for them would take time, but I'd begin with the basic splash art for the champs to begin with and maybe put animation on the skins if you get to another mastery level with them.

Here's what it looks like in Hearthstone to give you an idea: http://media-hearth.cursecdn.com/avatars/149/164/2.gif

So tell me what you guys feel about my idea and what could be better about it.

P.S.: I don't know if this is the right category to put this discussion in. Feel free to change it in a better category. :)