I was wondering if in a flash would be a good stage trick if not what would.
Which "In A Flash" do you mean ?
There is some Jay Sankey thing called "In A Flash" which is a card trick, completely inappropriate for stage magic, but there is also a box magic trick called "In A Flash" that can be used to produce doves or a rabbit, etc. .
The box trick looks like this : In a Flash
A box with an open front is shown empty. Instantly a rabbit or a couple of doves appears in the box. Is that the one you mean ?