Like most Pokmon cards, the value of Shining Gyarados depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Neo Revelation)
Here's hoping internal changes to the art creation process have been implemented so this kind of slip up doesn't happen again
Do not rely on one test Look for several warning signs that support the same conclusion
The mana base is a good place to start since you want to take out a lot of tap lands if you want to be competitive
Obviously, compared to Birthing Pod, this new Sidisi requires a little more set up
They, however, were not expecting for Volcanion-EX to finish both 10th and 11th