Good stuff, gameplay wise you'd defnitely think the cards are undervalued but it's just the new reward set with lower power and such a huge supply that even with the current demand they aren't too expensive. Which is a good thing, people with less to spend and invest in the game have options to at least buy something and start building their collection.

minor mistake here I think:

at Silver cap (level 5) it has "only" 4 shield

It has 3 shield and 4 hp at level 5, judging from the screenshot.