It’s pretty basic, but really useful. One card says “Combine elements” and from that, you might take a couple prior aspects of your story in a way you had not intended to go. Then explore what happens when you do.
Another says “Change your point of view”. So have your character question whatever is happening. Things like that. It is designed to rip you out of whatever headspace you are in, throw you into chaos and let you develop ideas in finding your way back to your original intent.
At least thats what it is for me.
I’ll keep that in mind.