First you need to complete all quest which is by gaining 500 score to unlock the upgrading feature once you have done that you have to pay 1500 coins per card to upgrade.You earn rare cards from all levels the fastest way to earn them are by dueling the Ai4 (Top50).To acess Top50 on kong click quest than look to your left you will see top50 in a dullish colour click it.
You can get shards from donating to elements through its paypal system which it will give you a reward code than you type it in the redeem system and pick it.
i’ve been playing the game for a while now and have had several different try’s at the game and my strategy, i recently started a new game and i want to know how do upgrade a card and how do i get these rare cards everyones talking about and shards, i’ve never seen them before in the game. help would be much appreciated
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