Easy Fold by Matthew Wright

https://stmagicbox.com/products/easy-...

The Mercury Folded Card has been used as a reveal for some of the greatest card tricks ever created. Many of the biggest names in magic have added some kind of folded card production into their repertoire and dozens of ingenious devices have been invented making use of the Mercury Folded Card. Thousands of magicians have invested in these creations only to see them tossed into "The Bottom Drawer" because of one issue they all share... The Mercury Folded Card is a difficult thing to master when under pressure in a real-world performing environment.

Easy Fold is designed to help solve that problem.