The easiest way to get upgraded cards is to play against the False Gods. (This is challenge level 7… but IMO, easier than trying your luck against the top 50 decks). If you beat a false god, any cards you “win” from the random spinning thingy will be the upgraded version. If it is something useless to you, like an upgraded Photon… just sell it and use all that cash to upgrade one of your own cards.
Just so you know.. there are a few decks that can beat false gods without any of your cards being upgraded. Of course.. upgraded cards really help… but you got to get them first.
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