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Yes, level 3 too, I can not play it and I put it on sale ... but I get the impression that the cards are somewhat devalued.

My guess is that you need 2 gold cards to combine which makes it difficult to level up further. Also theres nothing showing that it is a gold card on the battle screen (at least the hero doesnt show p as gold)

Yesterday I got another gold! I think if I sell them I could reinforce my decks by leveling the Beta :)