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I looked at the decks of the winners. Wow, I have a surprisingly large collection. The main gaps are the lack of Marwin (1 copy), Lysandra (1 copy), and Mjrabain. Among the smaller things, there's Yorm, the forest horror, Vesper (1 copy), and Jiraiya (1 copy). Most of the decks are easy to assemble; in the worst case, you can swap the under-fully-upgraded cards for the first thing you find. I'd like to fully upgrade Gremoire and Vira, then Octris, Cerberus, Leitham, maybe another copy of Valnareik, and other minor things. I'm very happy; the results were worse in the previous Grand Prix.