So, I believe I read about this roughly two years ago.
Someone created a ruleset to play with a standard deck of cards. I think every suit represented a specific class and had certain abilities. The immediate feedback was very positive.
If I'm not mistaken, there was also a Kickstarter (or similar opportunity) to purchase a deck with custom art, tailored to the ruleset. But, the game's perfectly playable with regular playing cards.
I tried googling, asking Bard, and focusing on BGG, but I didn't find anything.