The key terminology here is basic Energy, you need to get three different types of basic Energy on the card before you can even attack, locking out shortcuts like Aurora Energy
The box is from a very low-print run, and Heritage says the fact that it was actually sealed with no visible damage explained " why the demand for it was so intense
Whether or not a copy still sealed in the original trophy case would have fetched more remains to be seen, though, given the card's value, it's perhaps a little surprising that the seller opted to open it up
Some of them aren't even about rarity - they just denote a particular printing method
Heres a look at 10 of the most valuable vintage Mickey Mantle cards to come out during his playing career
Their standards allow slight imperfections even at top gradesa 55/45 centering can still achieve PSA 10