That's why it's on my third list, but it is pretty strong as self-recursive fuel
25 Worth A Ton: Blood Mefist ($1,500) The reward of the 2011 Yu-Gi-Oh championship, only a small handful of these were made for sale
The original set of the Pokmon TCG were released in 1999, so to still be in perfect condition after 20 years is impressive
If you go by TCGplayer pricing, the highest-price equipment on their website is a serialized version of Shadowspear, specifically the reskinned Morgul-Knife from Lord of the Rings Commander
Perhaps most interestingly, of those I spoke to who use unofficial apps over Master Duel, a larger majority also invest in the TCG compared to Master Duel players - who typically saw the game as their primary or only way to play the game and didnt collect physical cards
That way I have more slots to think about more possibilities