No fair! They're using brains against us! We removed our brains to make room for guns and explosives!
I was finally able to break Grifters out with my group yesterday, and we LOVED it. Looking at the promo cards (I was a KS backer), it certainly looked like it would throw the game off, and also invalidate deck depletion as an endgame condition. So what's the proper way to use them?
Check out Grifters Kickstarter Promos Rulesheet.