You can switch in a gimmicked deck (Invisible, Brainwave, Cheek to Cheek, One Way Force, Svengali, etc.) or a stacked deck (Mnemonica, Aronson, etc.). I was fooled very badly by Cristian Engblom using his Cooler gimmick to switch in a Cheek to Cheek deck to perform aTriumph routine.
Also...