Any clue why BFZx Flooded strand has started to sell for $500+ after years of hovering in the 200s? | tcgmode

I've been sitting on a flooded strand expedition since prerelease, so I check the price every few months to see if I should cash it in or not. After years of sitting at roughly 200, they are suddenly selling at hundreds of dollars higher. Listings are 300+ and there are multiple sold at 500+ over...