The second most used item I use in my studio is my Mini Misti stamping tool. The Misti has been copied and in all its incarnations I still love my Misti. Silicone/acrylic stamps and rubber cling can be used in the Misti, I can make as many multiples of the same card as I want the stamp won’t move. Perfect every time unless the user messes it up.
Let me know what stamp tool you use and why?