Window Killer is a great idea to add to your performance. You can bring up a card or change a card into a bill. Killer Window is a killer effect for your viewers. Easy to perform and easy to create. Once you have built the gimmick you will always use it any time and any where. Try Killer Window and have fun!"I use it always and the result on the viewer is very good!"Mauro Brancato MerlinoTRY IT!