The trouble with the zoom as it currently stands is that if you have one full line of cards, highlighting a card can push the other cards aside, creating a second line of cards. This moves everything about, creating unnecessary and distracting movement on the screen. Part of the trouble is so much of the screen is taken up by the different fronts, that the individual cards are too tiny to read any useful information off of without zooming in and out.
I don't know how feasible it is, but ideally there would be a pop-up enlargement of the card as you hover over it. Like in Elements
(in the picture the mouse is over the cat card, but my print screen function has auto-edited out the cursor).