If, for some reason, you're looking at a Pokmon card to buy, but you can't physically hold and inspect the card for yourself (for example, if there's a global pandemic, the shops are shut, and you can't go within two metres of another person), always ask the seller to take an original, high quality photo of both sides of the card for you
The Zygarde card was an instant hit among fans and quickly became a valuable collectible
If you want to know how much it costs to grade cards, or if it is worthwhile investment, all your answers about Pokemon slabs can be found here
But thanks to Mew, every single deck in the game can now have its own version of Mewtwo ex, and one that can be activated quicker given its three Energy cost compared to Mewtwo ex's four
There's no need to attack the first few turns while setting up anyway