Being one of the first iconic cards, and an absolutely beautiful looking one at that, I'm not surprised this is demanding a pretty penny right now
play and crack another Memory Jar
Interestingly enough, the card itself has no value in the trading card game, as the description, roughly translated, reads "We certify that your illustration is an excellent entry in the Pokmon Card Game Illust Contest
Some spells with amass require a different target
You can use Party Thrasher to get your spells out cheaper, for example, or Nico Minoru, Runaway to pile on some extra burn damage
Cards that appeared in the 7th Edition Starter special pre-constructed theme decks did not appear in boosters