Challenge Mode still exists, and you should be able to get packs that way.
Best way to rise up is to finish the live missions, and sell off the cards you can't use. If there aren't offers for them and you're in a hurry, you can quick sell. You'll lose some points over putting them out in the Auction House, but it's quicker. Decide what your time is worth, and run with it.
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"You could not live with your own failure. Where did that bring you? Back to me."
Thanos
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