While condition plays a role in this, there simply needs to be demand for a card for its price to increase, and, likely, this card doesn't command the same demand that the newer promo versions do
Then you need another card in addition to this meaning you have three for oned yourself
Here's a description from Iconic Auctions about the recently sold Charizard: This is the Holy Grail of Pokemon cards, the most iconic and important card to both the Pokemon franchise and its die hard fans
Market price $3.52 Based on the latest market prices tracked on TCG Stacked
The section above contains every official Pokemon expansion set on the books in 2026 so far, but weve left out niche exclusives like event promo cards, box toppers, or movie promotional cards
That sounds like a good place to find white, Boros, or even cat aggro