I have 3000 Clintz, and basicly a card that looks useful cost around that much. I cannot sell my current cards, because the game forces me to buy credits first. I don't want to buy credits, I just want to have fun here.
When you play a dt, even just 1 of them, you get 50 clintz for free. and if you want to sell something, but dont wanna buy credits, theres always the sponsorpay uption, that you can get for free. thats how i even got 3143 clintz and cards like eyrik and jessie right now