When choosing a set, look for value spread across multiple cards, with a focus on cards that will appreciate in value due to demand from multiple formats, are hard to reprint often and were undervalued when on shelves (since this may indicate lower total products sales)
Alternatively, you could use a card like Goldberry, River-Daughter to move one of your Finality counters around to protect the artifacts you need the most
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These cards help you to jump ahead on mana without the need to commit extra land drops, which is crucial in a format where explosive starts often determine the game
Meanwhile, local game stores can run more unsanctioned proxy events
Hopefully, by now you see my point about the purpose of these sealed products