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Specifically, this one

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4) Sylveon Master Ball Mirror 068/187 (~US$90) Depicting the second-most popular of all eight Eeveelutions, the Sylveon Master Ball Mirror card is sure to secure its place among the standout cards from the Terastal Festival ex [SV8a] set that every collector or player should own

There's nothing that fetches "Mercenary cards with converted mana cost 7 or less", let alone a continuation to higher numbers like 30

Zapdos ex (202/165) Scarlet & Violet 151Price: ~$51.66 Why Invest: A striking full-art card from the beloved 151 set

While it is by no means a necessity, I will say that it is incredibly satisfying when, as a fighter, you can slap down the gold and pay for your first set of plate armor