this card works similar to a pillar, right? As in, it produces the quanta at the end of your turn, after creatures attack?
Yes, that was the original idea. The amount produced is based both on stack size and number creatures matching your mark.
then there shouldn't be any problem with fractal BL. the BLs die, so they don't contribute to this.
even if they did contribute the moment they entered the field, for you to be able to play a second fractal on BL, you would need to play 9 or 10,depending if its upped or unnuped, BLs from your hand... not possible