Other financial outlets have accredited this increase to, likely, being an easily identifiable buyout
His Burning Chains ability says "When the chosen player loses the game, you win the game." But, like...that's what happens already in a 1v1 game when your opponent loses
Even in mid-grade condition, it commands serious money, while graded copies can sell for eye-watering prices that feel unreal for a single card
Honorable Mentions - Special Treatments If you visit Scryfall and sort Final Fantasy cards by price, you'll find dozens of other cards intermixed with those I referenced above
Any other ideas for the activated ability (that are not regenerate..)
We are certainly not shocked to see a Charizard card be the top of this expansion's most expensive list and we were absolutely right