Confused about Snowdown Shop
So I am confused as to how riot chose the skins on sale for the Snowdown shop. Because I have skins for every one of the champs I got (2 for Vayne already) and I rarely ever play Gangplank and Veigar. I saw a lot of people saying it was based on mastery and a lot saying it wasn't. And I'm only mastery 4 on Lee and Vayne, with Cait probably being at level 3, and Viegar and GP at 2 or 1. So if anyone could inform me that would be super appreciated! [slayer-jinx-catface]