While there is a lot of variation in average sentiment between nearby sets (and certainly a lot of variation in flavor text sentiment within each set), there is a slight upward trend over the course of the game's history
Chart shows the price of Pikachu V-Union [Jumbo] at the end of each month going back as long as we have tracked the item.
It's normal up to this point, but the problem is that in the process of preventing Yuzu from picking up her action card, she slams her D-wheel into it
ST6-03 Gabumon Digimon with effects that can attack in succession are able to send targeted cards to the trash at a faster rate than expected, and the output of effects that take advantage of the trash and the stability of the deck is higher than expected, due to the inherited effect of this card to exchange hands multiple times in one turn
"The price is not likely to decrease in the future either." Pratte says that fewer Gym Heroes 1st Edition boxes were probably produced than some of its WOTC predecessors
Currently, Glaceon EX is listed for around $450 on TCG Player not as hefty a price tag as some of the other top cards but still a pretty penny