Gameplay and collector interest
If your opponent activates a monster effect such as Nibiru or Ash Blossom and you control Ryzeal Cross with no monster on the field, you can chain this card to summon a Xyz monster and negate that monster's effect using Ryzeal Cross
So in this particular case, Act of Aggression can't do anything to stop the Veldalken Anatomist unless it say, targets the opponent's Azorious Guildmage (also Veldaken
If you are grading to preserve the card's condition through the encapsulation process or to authenticate it or to know it's 'real' condition, it may be worth it despite the value gained (or lost) in grading
Playmaker, Soulburner, and Blue Maiden are foreshadowed to be the heroes of Link VRAINS for Season 2
When buying or selling Umbreon EX and VMAX cards, always check multiple marketplaces and consider getting valuable cards professionally graded