Devils Mark (Sigillum Diaboli) by Alan Rorrison and Big Blind Media video DOWNLOADA one handed, insanely visual, cover free version of Roy Walton's Card Warp! Sigillum Diaboli is not only a trick title that'll win you a game of Scrabble, it is also the most VISUAL twist on the classic Roy Walton Card Warp routine in existence! Imagine taking a selected card and having it signed. You then draw a mysterious sign onto the selection the "Sigillum Diaboli" or the Mark of the Devil explaining how it will cause the playing card to reveal