I have just used a "thinned blade" screwdriver and gently slip it between front and back of the case/slab and once in, twist. You may have to work your way around the perimeter of the case a bit. Very simple, effective and the blade never comes anywhere near the card.
P.S. I had previously customized the driver that I use for some gunsmithing chores, but any blade thin enough to slip in along the edge of the slab will do.
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vg-g-f-p t205 set - 54/ 208
ml subset 4/ 12
variations - 3
hof'ers - 4
short prints - 3
different backs - 13
cards over $30 - 4 
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