Way to make Missions feel worth doing

Ok. So I've had a couple of games where I noticed something about missions to accomplish in game; like a mini game if you will. The times I saw it, I didn't think much of it, and just did my normal thing.

But upon seeing threads about Missions, I had an idea to make them worth taking the time doing:

Mastery 8.

Not only will this show you can get multiple S ranks by first getting mastery 7, but also shows that you have SUCH mastery over your champ that you can even play a mini game in a game, while playing the mini game of outplay in your enemies.

Only the ones with real mastery of thier champs can get this mastery.

Also, it gives more reason to focus on chests, essence, ect, if Riot would choose to use that to gain mastery 8 much like mastery 7.

Once you get a certain amount of missions completed, you can use your essence to unlock mastery 8 emote.

Than its mastery 8 spam, and hue hues all day! ;)