Hello there,
I think it would be nice to have a topic on the forum where people can ask other people for cards they need on Game Dev Tycoon. I didn’t see one of this yet so I thought I would make it and I am searching for a card too at the moment so I thought it would be convenient for the Steam players of Game Dev Tycoon.
Here’s an example of how you can put it:
‘I need the card ‘blah blah blah’. Does anyone have it and want to tradeit with me?
…’
Well… let’s start this thing shall we?
This is not an example but something I really want… 
I need the card ‘The Itch’. Does anyone have it and want trade it with me? 