(deck thru box using rider back box ) and deck transpo ( go for pen to sign card , bring in red decoy gimmick
put real deck in pocket when going for pen show as deck diminished to their card , take decoy palmed into pocket , drop in pocket , pull- out regular deck for examination .
the blowing thing was the first thing i thought when i made my gimmick and tried it out .. and yes its cool way to diminish it .. it is way cooler if they dont see you blowing