Since starting to collect the monster about 5 years ago, I've wanted to know the general population of each back relative to a 524 card set. I'd like the composition of my monster to reflect the relative percentage of backs that exist.
I cobbed together some rough numbers a couple of years ago using Scot Reader's data and Bill Brown's superset spreadsheet. Thank you both Scot and Bill by the way for all your effort and willingness to share! I am currently using those rough numbers as guideline for my set.
I tried to get a more definitive answer from the t206resource guys a couple of years ago when they were rolling out their website, but the general response was that there are too many variables to determine the "relative % of each back per 524 cards". I can see why that may be true, it's certainly true if I try to do it alone

, I was just a tad surprised. I wasn't and still am not versed enough to question if it is actually possible or not. I just suspect that a good estimate can be made.
Anyway, here is the list of relative back population which I am using:
- back (target number of each back per 524)
- p150 (54-62)
- p350-460 25 (24-27)
- p350 (153-168)
- p350-460 42 (1-2)
- sc350-460 42 (3)
- sc150 25 (7-8)
- sc350-460 30 (9-10)
- sc150 30 (25)
- sc350 25 (11-16)
- sc350 30 (61-65)
- sc150 649 op (6-9)
- sc350-460 25 (2-3)
- sc350-460 42 op (6-10)
- sov150 (8-11)
- sov350 (19-22)
- sov460 (4-6)
- pb (26)
- om (9)
- epdg (5-8)
- tolstoi (6-8)
- cyc350 (5-6)
- cyc460 (1-3)
- ab350 nf (1-4)
- ab350 wf (3-11)
- ab460 (1-4)
- hindu brown (3-7)
- cb (1-3)
- bl350 (1-2)
- hindu red (1)
- lenox black (1)
- drum (1)
- uzit (1)
- lenox brown (1)
- bl460 (1)
All those (1)'s are really a very small percentage, but I rounded up to (1) since I'd need 1 of each in my set to represent the back distribution. I doubt I'll ever have any of those small (number) backs - if I have to pay market price for them that is!.