Pokmon cards sell regular in the $5 to $2,500 range for individual cards
Getting a 2/3 flier for free on turn 5 is okay value, but the reason this card made the rankings is the infinite combo possibilities
Two years and one GOTY later, things are different and appetite for this drop will be majorly heightened this time around
Not only do you get to find the biggest creature, be they dead or in your library, they will get at least 10 extra power, alongside all of your creatures, and be able to attack immediately
The supply of 10th Edition is low, which has lead to a cycle of the card being bought out, spiking the price up to around $30, only to be relisted with prices dropping back down to around $10
Because it was a collaboration between the exhibition/museum and Pokmon I guess it was led by the museum.