If anyone gets down to this page, I have a suggestion for the Black on Black decks.
I took the sharpie and put a groove in the tip by pressing it against a dull knife edge. This made a sort of track for the card, so that there was minimal slippage when running it down a card edge.
I've been able to get about 2-3 decks for a new sharpie.
I've done 2 Shadow Masters, a Seasons black deck (purchased used, so I didn't alter a new deck!), the black Dia Des Los Muertos (Edgy Bros.) and a Quicksilver. All looked great.
Sorry, I don't own a good digital camera, so you'll have to take my word for it. They looked comparable to the previously posted black decks, though.