Wild Card is a relatively short run accessed by taking a left from Bear Cub at the marked sign.
This run is not overly steep as well and is a good jumping off point to skiing black diamond terrain.
This trail was used in the 2010 Winter Olympics as the start of the women's downhill, as it links to Franz's at the bottom as it widens, which was also used as part of the course.
Wild Card is one of the advanced runs on Whistler that you can find sometimes groomed, or sometimes featuring moguls.
Check the grooming boards at the Roundhouse as well as the top of the lifts if you want to be sure.