Chance cards!
Like Wild Cards, Chance cards allow for someone to do pretty much anything. The difference is that these cards is that the player submits an outcome for the card player if it is both a strength or weakness. It;s then determined randomly what effect happens.
It might be good if this was then given as an option with a Narrator, when something is submitted for approval but doesn't quite fit the card used. For example, someone says that they are smart enough to figure something out with a card that is "Tough as nails" the narrator says, "No, but if you like you can write to effects out with a chance card."
That process is then proposed for submission.