I think it's the jam winner. Clearly a really well made team effort. The only thing I dislike is both times I died to the feet re-roll giving the opponent an absurdly high roll count. Don't know if that was just bad luck though.
The card guy is definitely the hardest of the bunch in normal mode. If you ever try again, I'd recommend using the wood trinket, it allows you to lock his dice so he can't re roll them and scale his score :)