I've only ever had my cards graded with the Certified Guaranty Company (CGC) and Professional Sports Authenticator (PSA), but I do have some opinions from personal experience
For new collectors learning to play, they provide an instant, balanced deck to grasp fundamentals like turn order, Energy management, and type matchups without the daunting task of sourcing singles
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Primarily, Ivy, Gleeful Spellthief is best used within decks built around buffing creatures, especially Enchantment decks
As you might expect, in the modern age of Pokmon collecting, it's usually not so easy to find one at that price
The draw-on-cast trigger of Mine is the Only Truth can help convert wins off spell loops with cards like Gravecrawler or Underworld Breach