Trade up costs are extremely high. Not only do you have to grind for hours to get cards, but you have to pay huge credit costs.
If you are trading up, on top of tons of cards, this is how many credits it will cost you:
1,500 credits = 1 iron
4,500 credits = 1 lead
18,000 credits = 1 silver
90,000 credits = 1 gold
540,000 credits = 1 cobalt
I am fine with the card cost, but the credit charge does not make since to me and costs me a ton. What do you guys think of it?