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I managed to beat everything on the first try, except for the second-to-last level on Death difficulty. I didn't have a deck prepared, so I used the default one to lose and then complete the level with a deck purchased from the shop, but after losing once, I checked and found some unlimited update from 2016, and I won without any problems using that. As for picking the portal, I always used my "aggro" deck, and it worked on the first try.