Reap and Overdose are probably going to be fairly controversial, mostly because they're mechanics that encourage you to play in a way that is usually a downside. This is something that is intentional - I want this world to feel oppressive and get a "choice between a rock and a hard place" decision a lot. I also think that they're inherently more skill-testing (and punishing), which is something I enjoy in game design.

Most reap cards will be designed around effects that finish games, or effects that you don't want to activate multiple times per turn, to discourage going "all in" until you are sure the game is over.