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
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
Primarily, Ivy, Gleeful Spellthief is best used within decks built around buffing creatures, especially Enchantment decks
Her Pikachu/Mimikyu, shiny Magikarp, Mew, the Yokohama Pikachus and the Chespin/Litten/Inkay trio are all some of my favourite promos ever and they are all hers
Graded Population Report: Larry's Skill #139 Visualize the distrbution of grades in the chart
On October 9, 2020, a PSA 10-graded 1st Edition Shadowless Charizard was sold to rapper Logic for 204,650