Beating an opponent will earn you a chance at the card spin, where you spin the cards from your opponent's deck in hope you win 3 of the same in a row.
First 2 in a row = 5 gold coins.
3 in a row = the card.
Also note; the bigger and various the opponent's deck is, the lesser chance you have of winning a card.
Upgraded cards can only be won from Fake Gods and Halfbloods.
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