You wouldn't draw anything on the actual table. You can only allow to buy stuff that is available on the armory screen of the app. I just assume that, if you have this skill unlocked, the app will add one extra card in there for you to buy.
I thought the same thing, but it didn't work when I tried. Maybe I didn't do it the right way? Worth noting is that you can change skills, so that probably means this skill doesn't do anything (otherwise you'd always equip it before opening the armory screen, wouldn't you?)