Prices have been climbing steadily as more collectors learn the story behind the two variants and seek out the original version, and the card has become a staple of the "interesting stories" conversation that drives so much of the vintage market
For a full comparison, read the Play Boosters vs Collector Boosters MTG booster guide
You can obtain the Mega Gardevoir ex (4-Diamonds rarity) card by opening Fantastical Parade from Fantastical Parade set
Graded Population Report: Steelix ex #95 Visualize the distrbution of grades in the chart
2 (and, by extension, in Neo Genesis in the TCG) with Pichu, Igglybuff, Cleffa, Togepi, Tyrogue, Magby, Smoochum and Elekid marking the first-ever pre-evolutions of existing Pokemon (save for Togepi, which debuted in this generation)