I’ve been trying to save up to be able to trade up all my cards to get a nice cobalt card for one of my mercs, however I’m not sure how to do it without my trade ups going all over the place or paying more than I need.
Assuming I have a an abundance of lead cards. How much money and iron cards would I need in order to get ONE cobalt card. Been trying to do that math for so long and I keep messing up.

