[quote=@Satoshi Kyou]
[@SilverDawn]that was custom structure you never said anything about custom packs. if you dont want OP decks to be build with custom structures. Custom boosters could be a way to get your hands on custom cards
[/quote]

Page 36
"Because of these fancy shmanshy new archetypes, we'd need to create new boosters with support for them, so if you have any more cards that you want in your archetype (cough cough Parshath), send me your ideas for new cards. Or I could make them for you."

I remember now. I wanted people to send me any ideas for custom cards so I could put them all into a booster.