Marbles is not easy. It is knacky. It is weird. It will take weeks to master. It will cause massive finger cramping. You may develop blisters.
Still interested? Good 🙂 Marbles is a one-handed pop-out move that looks utterly impossible. A card can be selected through various forms of selection taught, and at any moment with a flick of the wrist, the card pops out at an impossible position.