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PSA, for example, rates their cards from PSA 1 to 10, with PSA 10 being the highest rating, implying that a card is in perfect condition or Gem Mint

Graded Population Report: Mime Jr #157 Visualize the distrbution of grades in the chart

But it is NOT recommended to do this test on high value cards at all

But as the company has a mark and reputation, the vast majority of collectors turn to it to catalog and hope for the best possible graduation, hoping for a grade 10 and still as Mint, which is anyone's dream

With any commander decklist there's infinite improvements, tweaks and changes to be made, so take them as a starting point (especially the mana bases, as they are based on what I own on Magic Online and not what's most competitive)