It's high value on the secondary market is due to Atraxa and other new cards in her deck like Deepglow Skate
Im a big Gyarados fan in general (I love the shining Gyarados from earlier sets), and this is one of the cooler artworks for Gyarados that Ive seen
Wait, arent there misprints in Pokmon
As always when forming ranked lists, Im judging these cards on power and efficiency, looking to get the most impact for the least mana
Pillar Analysis: High Power (Dual Land), Scarcity (Beta, Reserved List), Format Staple (EDH/Vintage)
So it seems the price spike is purely down to numbers: the fact that demand for the card has more-or-less doubled, while supply has remained the same