Quote from reddit: 'When you craft a card of SR of UR rarity, you not only unlock the secret pack associated to it, but also get a free pack (once per secret pack). That's 47 more chance at potentially getting a UR that you can dismantle for free crafting points.'
List of craftable cards for free secret packs:
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Fresh Account with 22k gems and 150SR CP / 150 UR CP for sale:
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