I've just gone back through my old notes and there were three Team Coach competitions in 2013 where you could win a prize card: 4 Star, 10 Star and Who Will Win.
I know that you were awarded a prize card if you finished in the top ten of 4 and 10 star (i.e., 20 prize cards per week) but I'm not sure how many prize cards were awarded for Who Will Win ... possibly 10 as well?
If we make that assumption, there were 30 prize cards on offer for the 23-round season, plus the four weeks of finals. So, 27 rounds x 30 cards = 810 prize cards in total.
Because you could choose which card you wanted, it's also fair to assume the big Melbourne clubs were overrepresented in winners' choices.
As a Richmond supporter and player of the Team Coach games back then, I made it a priority to get all three Tigers. I also chose some other players from the big Melbourne clubs but also decided to get a few players that would end up being much rarer.
In short, it's hard to know how many Dusty prize cards there would be, but it wouldn't surprise me if at least 20% of prizes (say, 150 cards) were his card.
Still, that would make it a pretty valuable card given most would be in PCs!