Ideas needed for an unusual collection!

[drsma1]

1st picks, 2nd rd of the draft?

 

[Tom12]

Maybe a certain card number? If I did this I would collect the number 12 so it would be cards with numbering 12/15, 12/25, 12/50, 12/100 etc. but of course I would miss out on any cards numbered lower than 12

 

[bradlieus]

Ooh also a good one - I'm thinking 13. Wonder how many commons I have that are number 13 in a set...