The cards you are keeping as an investment would be investment income if and when you sell them at a profit. File these sales on Schedule D (personal/hobby).
The cards you are buying to resell at a profit are going to generate business income. File these sales on Schedule C.
And you can combine your sports cards and Pokémon game cards on the same Schedule C since they are part of the same card sales business. You don't want to file multiple Schedule Cs if you don't have to.
To minimize your audit risk, separate your business and personal transactions and be sure to include all of your business income and only business-related expenses. Don't include expenses related to the cards you are keeping for your son on your card sales Schedule C. You would only include expenses related to the purchases you intend to resell for profit. You don't have to make a profit, but you have to have that intention, which you do.
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