Actually, you cant give someone(even me) a free card. you have to sell it on private sales if you already bought credits.
You cant...however, you can sell your cards at the 50 clintz minimum through a private sale. If you have any credits, you out of luck since those are non-transferable. As far as giving away your clintz, buy their cards at inflated values (assuming that they can sell on the market). But you can not give you stuff away for free.
Hope this helps.