But i think i found a Blockchaincard, i just bought a Card with 100 Gold and got "Spirit of the Druids" 5 Star Golden Card and my Wallet Shows a new Card "SOGLAUNCHCD"
That was a free blockchain card that all SoG players received when installing the new release from Google and App Store before the end of April.
It was distributed by the team to all people entitled to it. So it's an external card not a card you get in-game.