Here is a presentational angle on the “Omni Deck” (the clear plastic deck of cards block). I bought one with the scorpio inside, which is a weird thing to look at (and even weirder to hold it in the hands). It is called the "Ominous Deck" by Diamond Jim Tyler.
Now if you combine that with the classic Omni Deck, you have a funny interlude. After the deck in use has changed into the Ominous Deck with the scorpio, and the shock has settled, secretly switch the scorpio deck for the clear one and leave this on the table. Suddenly, note that the scorpio is missing, and with the appropriate words look under the table, etc. as if searching for the “escaped” scorpio.
I know this is tough stuff, but within the right performance setting, and with the right kind of audience, this is a lot of fun.