I have to say, I think this one's a no-brainer tbh. It removes the need to mentally track skill usage during a challenge or contest, allowing the player to focus completely on the solution.
To be clear, my suggestion is now the toggleable skill panel in
Reply #2. I like Silken's idea as well, but a fully-toggleable panel seems to be neater as it shows everything at once.
EDIT:
Having said that, I can see the usefulness of, say, knowing how many Builders you've used and how many Platformers remain.I've added a poll since there haven't been a lot of comments, and I find it's more
usual for people to comment when not-in-favour