Sure, your opponent gains life, but isn't that a small price to pay considering you're only putting in a one-mana investment
Notably, a number of Amethyst cards feature a new archetype to Disney Lorcana, focused on bouncing character cards in and out of play for various buffs
You can check out the trailer below, along with additional details: Experience the timeless joy of the Pokmon TCG with Pokmon Trading Card Game Classica product designed for fans to enjoy friendly battles anytime and anywhere
The reasons why are pretty simple: everyone loves Gengar, and this is the first alternate-art Gengar card ever printed (if you dont count Phantom Forces)
It's actually quite a powerful ability, allowing all Islands to produce double mana for a turn, for the cost of a single mana
PWCC suggests that this leap in price could be down to whats been dubbed the Waifu Tax, a recent trend of problematic origin (as explained by Kotaku) that has seen Pokmon cards featuring female characters drastically increase in value