sorcery contested realm beta booster box Sorcery: (Beta) and Persecutor—stand ready to lead your cause Sorcery Contested Realm Gothic Booster

These are worth much less than cards with black borders, as they were from more widespread releases

There are just so many all-stars from MTG history here

Pull rate from Regular Packs: 2.05% The estimated pull rate for Gyarados ex (Mythical Island) from a Regular Pack is approximately 2.05%, meaning you might need to open around 49 Regular Packs to obtain it

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Unbroken Bonds has one of the most well-balanced varieties of valuable cards, including Rainbow Secret Rare GX pairs, Trainers, items, and Alternate Full Arts

It might see some sideboard play if a certain sort of discard strategy gains a lot of popularity, but I dont see that as a particularly likely outcome