Super Hotstreak Mastery
How about add a new "Super" Mastery a special mastery that gets obtained when you win X amount of games in a row with an S. And is lost if you fail to receive an S in the following game with that champion.
i think either 3 or 5 wins with S's in a row seems reasonable for this super hotstreak mastery.
Its basically a visual representation of hey!, I'm playing really really good right now, Fear me, Listen to my calls, Be tilted in my presence. For i am on a.....SUPER HOTSTREAK :D.
[slayer-jinx-catface]