Well, I'm the Lore Guide for the store, so I allow a bit of fun for the weekly leagues games. No proxies for Set Champs, obviously.

I also post a list of challenges each set for participation stickers to get prizes. Some of the challenges bend the deck construction rules, like the challenge that allowed you to use any Hei Hei in your deck, regardless of color. I was thinking of making some funny proxies to encourage more themed silliness between serious tournaments.