It's simple, fits into existing frameworks, and is super effective. I use it when playing pretty much every game now. When it gest used, we end up pushing out stories in directions the whole table loves, and makes everything more engaging.

In particular, I get a lot of mileage out of the O card in horror games. Knowing that my fellow players are on board for what's happening let's us go hard on the horror elements we want to see.

It's also really gratifying to see someone raise their hands in the shape of an O, or see a chat fill up with Os after an intense and exciting moment. Even when I'm just watching something unfold, it's a way for us to keep communicating with one another. We're letting each other know we're having a good time.

It's a fantastic, simple tool, and I think just about any table would benefit from using it.