Don't get fixated on a perfect 10 : Some of the best values are found in cards graded 7, 8, or 9
Number 31 Language English Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (10/4/2004) If you Donate an Aura, it stays where it is, but the targeted player now controls it.
Cost: 10 MP to Cast Sphere Grid: Blizzaga Description: Deals ice damage to an enemy. Effect: Inflicts a heavy amount of ice-based elemental damage to a single target
While these cards have seen some play over the years, delve didnt become as ubiquitous as it is today until it was reintroduced as the Sultai clan mechanic in Khans of Tarkir block
Below is a list of the top 4 defects to look for when grading your Pokmon cards yourself