Concept
The devil performs magic for people under the disguise of a human body.
Story Ideas
Papi's magic show is special. Before every performance he asks his audience what they would like to see him do. He then collects all of the ideas, sets them in a bowl and randomly picks which to perform during his show.
Make a survey on the internet, describe the setting and ask people what would they ask for a magician to perform. Then ask them what would they want him to perform if there would be no limits to what he can do. Collect these answers and use them as inspiration for your story.
Through the story you can show what humans are willing to see happen when they don't have to be the one pressing the trigger.
Anton can be another character, an angel, who has a magic show where she performs miracles for people, everyone knowing that she is a goddess.
Plot line
The devil pursues the angel into accompanying him into the Afterworld where they would perform for the dead instead.
Real life Uses
Ask at the end of the show for people to suggest an idea of what they would like to see being performed on stage. Collect all of these ideas and choose from them one or two which to combine in a routine later to be presented during the show.
Place this bowl of idea on stage and every time you ask for a spectator to help you perform something, you also ask him to randomly choose an idea from the bowl, which the spectator would have to perform.