Hello! I'm trying to print custom Magic: The Gathering cards (just for custom art cards. Not trying to sell bootlegs or anything) and I've tried pasting a printed front onto a regular card. That led to decreased flexibility in one direction and bubbling when bowed. I then tried getting it printed front and back on cardstock, bur they never quite lined up right and were still too flimsy.

Magic card stock is about 13 point (or 310 GSM from other sources). Could I print the fronts on one sheet of 6 point and the backs on another 6 or 7 point then paste them together? I wouldn't need to line them up front and back perfectly for printing as I could cut them seperately then line them up afterwards. But would gluing two pieces of cardstock together make it more stiff than their combined weight? If so, what pair of cardstock weights should I use to form a similarly stiff weight?