Certain cards will increase in value tenfold when graded 8 or higher
This strategy was not only the most popular deck and highest achieving, taking four out of five spots in the top 5, it was also shockingly consistent, with a win rate of 56.8%
For example, take a look at this LordKnightmon list
Creature - Phoenix Creature (CTRL to add secondary) Enchantment Enchantment (CTRL to add secondary) Instant Instant (CTRL to add secondary) Land Land (CTRL to add secondary) Planeswalker Chandra Ablaze +1: Discard a card
Promo Info booster NEXT ADVENTURE [BT-07] CLOSECLOSE BT7-101 C Option Thunder Laser Color Green Form - Attribute - Type - DP - Cost 1 Digivolve Cost 1 - Digivolve Cost 2 - Upper Text [Main] If you have a Digimon with [Hybrid] or [Ten Warriors] in its traits in play, suspend 1 of your opponent's Digimon
Even most pro players would benefit from a little work towards improving their card evaluation skills, and not just when a new set comes out