pokemon japanese booster box Inferno X Pack (Japanese) showcasing its Teal Mask alongside other iconic masks and forms as Tera Pokémon ex Pokemon Japanese Booster Box Protectors

Just what is the reason this card has such significant value

Mana Vault Mana Vault is part of a nasty 2-card combo: Mana Vault plus whatever busted 4- or 5-mana spell you want to play on turn 2 strong enough to be banned in Legacy and even restricted in Vintage

The practical implication: Japanese cards are generally easier to keep in pristine condition because the card stock is less prone to certain types of edge whitening that occur during the packaging and handling process

The rules of radiation are "At the beginning of your precombat main phase, if you have any rad counters, mill that many cards

For high-value cards, consider buying graded cards from reputable grading companies and cross-referencing with official TCG databases and product images