One important comment from Chris that you missed:

@FedeArgento asked: "So the rewards will be for each individual card? Not full deck?"

Chris: "Correct, per card not per deck so a single diamond in the deck makes a difference."

Given his two posts on this topic, it's pretty clear. I also think this is the obvious way to do it. Give me a benefit for forging my first meteorite. It just makes sense.