Two-sided playing cards with bleed and threaded text... on spread?

I think Im not as clear as I thought at first about how the text is supposed to flow here.

Can you show us a mock-up example?

As a matter of interest, I was testing in CS6 whcih happened to be open, and I'm able top flow text right to left across a single two-page pair if I place it it holding the Shift key in the right-hand page Parent Frame, but anything longer than will fit on a single spread then shifts to left-to-right. My solution to that would be swap the positions of the front and back pages and always place on the left.

Also, if after setting up the two-page parent pair you drag the name into the lower section of the Pages panel it will add the already grouped two pages. None of that may really be relevant in using Rob's method, but I found it interesting.

Thanks guys - I tried Rob's method, but it doesn't seem like threaded text frames want to behave- 
Allow Shuffle needs to be re-checked when text is flowed in threaded frames in order to not populate a spread with more pages, but reverting to Shuffle creates single additional pages rather than spreads.

Hmmm.... still experimenting...

I think Rob's method is probably simpler than mine...

If I understand waht you are doing, you should be able to set up single pages, rather than facing.

Add your bleed, then go to the Pages Panel and reset the number of pages on Parent A from 1 to 2, and use the Page tool to move them apart enough for the bleed in the gutter.

In the Documents pages section, turn off page shuffling and rag every other pagenaxt to its parner until you see the little vertical line indicating they will display as a single spread, and again use the page tool to create enough gap at the gutter.

Yoou should be able to thread text across the pages any way you like.