If you open one of those Rares, you then have a "free pick" for whatever will improve your deck the most - an Uncommon, or that Rare/Mythic (which is now worth 20/40 gems to you)
High-demand releases sell out fast When a new Pokmon TCG set drops especially premium collections, Elite Trainer Boxes, or limited promotional products cards can sell out the same day they are shelved
More to the point, Ouphe stands out as a great roadblock
This is the format that everybody usually gets into first thanks to its rotation and consistently smaller card pool than other Constructed formats
Pick a template (Modern, Vintage, Mystical Archives, etc.), then change anything: name, mana cost, type line, rules text, power/toughness, art, artist credit
You can also swap one of the Zapdos ex for a standard Zapdos in the meantime