I've used this method with tracing paper and tissue paper, though I don't stack it 14 deep - about 8 sheets is enough.
I trace the design with a pencil or washable pen (Pentel Handwriting) and have never noticed any transfer from that via the thread, but all my quilts get washed when they're finished so it wouldn't be a problem.
The tracing paper was about £4.99 for 40 A4 sheets. The plain white tissue paper was 99p for 10 very large sheets.