dustox pokemon card value 220 continues to shine. With PSA 10 sales sitting at $180 on eBay, you're looking at a solid 515% profit. Profit/loss calculation is based on the lowest tier of grading which Evolves from Cascoon Type Pokemon TCG - SM7a -

But scarcity alone doesnt explain the full premium

When Pokmon-GX has been Knocked Out, your opponent takes 2 Prize cards

Pull rate from Regular Packs: 0.36% The estimated pull rate for Revavroom (Shining Revelry) from a Regular Pack is approximately 0.36%, meaning you might need to open around 282 Regular Packs to obtain it

The Blue Nami deck automatically wins the game once there are no cards left in the deck

Not a lot of creatures will survive 4-8 damage

Note that this doesnt care about who controlled the creatures that died, so you can throw a bunch of tokens into your Viscera Seer to set up a huge swing of card advantage