[quote=@Jangel13]
Well I assume Konami since they actually publish the cards 
[/quote]

Step 1: Get idea. Make sure you haven't done idea yet.

Step 2: Balance the idea. Or don't.

Step 3: Make them at certain intervals and sell them for €$£

Optional step 4: Reprint some cards if you know the players want them for more €$£

On a different note, working on a post. Actually getting shit moving now.