Recent data on TCGPlayer only shows lightly played cards, which sell for a bit above $100, but near mint cards are only listed above $400, making it one of the most expensive Gengar cards in the Pokmon TCG
The other reason was that Fires of Yavimaya was in exactly the right spot on the mana curve
Youll run into: Tokens (usually standard size, but occasionally printed in other sizes depending on product) Emblems and checklist/helper cards (standard size) Oversized cards (promos, special products, Planechase planes, Archenemy schemes, Vanguard, and other delightful chaos)
Quickly reporting back to her party they began to formulate a plan of action
Your opponent is unlikely to go up to three creatures once this is in play, and if they already have three, then spending your turn on a four-mana do-nothing enchantment isnt a great move