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And then there are the collectiblesthose rare cards and special treasures truly make the set special

There are no doubt many

Kricketune V, Victini V, Empoleon V, Necrozma V, Corviknight V Rapid Strike Urshifu V Korrinas Willpower Mustard Rapid Strike Style Victini VMAX Rapid Strike Urshifu VMAX Corviknight VMAX Korrinas Willpower Cheryl Octillery Level Ball Rapid Strike Energy

Trainer cards: These provide support to help you draw more cards, boost the strength of your Pokemon cards, disrupt your opponent's strategy, and search your deck for key cards when needed

This is why these cards were powerful but not really problematic when they were legal in Standard but were dramatically format-warping in Legacy

An example from CEDH is Glarb, Calamitys Augur