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To upgrade cards you need to have collected some "Dust". Refer to consuming section to find out how to collect said "Dust". Once you have enough "Dust" in your possession click on the card that you would like to upgrade and the screen will change to show you all the possible upgrades for the card typically it chooses to show you the stats of the card once you upgrade it one level. To upgrade tap the "Upgrade for X" button (X standing for the amount of dust it will cost to get to the next level).

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