Ultimately an RPG that uses playing cards as a randomizer but doesn't actually utilize the cards for. You know. The things that cards can do. Is just using them as a fancy, weirdly shaped die.
A few things that cards can do that dice can't:
- You know that dice superstition that people have about how if they roll enough low numbers they're bound to get a high one? That sort of actually works with cards provided cards aren't immediately returned to the deck and the deck reshuffled. Because there's a limited number of each "roll," good or bad.
- You can hold them in your hand. It's basically like pre-rolling a bunch of numbers and then getting to spend those numbers as they become relevant. Maybe you only get to draw more cards by playing all your cards, meaning that if you don't conserve your good cards your character's luck is eventually bound to run out.
- You can make poker hands with them. Added to the previous point, maybe you will be forced to play a worse hand and have your character flub a non-critical roll because you're hoping for that better hand that'll turn the tide.
- There's suits as an added bit of information that can be utilized for some mechanics. Maybe matching suit with an action type results in an extra benefit?