I get that you want to do a cute winter theme, Riot, but...

I think just about everyone who plays League would VASTLY prefer it if ALL champions were available in the current iteration of URF mode, even if they don't have a winter/christmas themed skin. And there are some champs WITH such skins that ARE NOT in the mode, like Sona, so... You're not even sticking to your guns entirely. Give us all champs for URF, or just don't bother with URF at all.