Haha, wish I could say the same.. There's just a playable character that moves exactly like this Santa of yours, but he wields a big ass axe. And you can get various skins for your champion in the in-game store, including some holiday-themed ones. You should totally mail Riot next year about them using this design for a skin. xD
I think it'd be cool for you as an artist to have your artwork used in one of most popular online games nowadays as a skin for one of the most badass characters available.