Perhaps its the power dynamic created by untapped Islands, the idea that you suddenly need to wait for your opponents permission on every attempted play
[22] For instance, cards featuring Charizard and Pikachu are some of the most popular ones, so a minor or major error can increase their price tags
Note that the final ability doesnt really work that well
Cultivate Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle
The theme is more elemental and less spooky, but still clever and competitive
Clearly, investors are expecting Hospitaller to be a popular upgrade that players will pay a pretty penny for