Charictor Gen I like the simple start you have chosen with the card suis. I feel this absrtact unclear way give mistary and structure. Perhaps the game is about wakeing up the charictor.
Rewards if the players are presented with a mystery and they have a fair chance to unravel it, that is the reward.The player if imersed in the drama will be exilerated upon exposing the story
Walk away from the game.Don't talk. Create an adorable charictor and make them resposable for their demise. A nother aproch is to allow players to know of opertunities lost. Make them lose, time, resorces, position, established work,status.
Sacrafise is a good way to let players win. How sure are they that they have to win this one. What or who are they willing to lose, gamble on. What if there is always a down side. Hope you win this confict IF winning matters.