mtg mom collector booster box March of the Machine Commander Decks Traditional Foil of any rarity replaces a Common in 33% of boosters Collector Booster Box $600 :

For the rest of this turn, unless this effect was negated, you cannot Special Summon, and any battle damage your opponent takes becomes halved

Since Psychic is weak to Psychic in this era of Pokmon, one of the best ways to cover Hitmonchans weakness to Psychic, is with your own Psychic-type Pokmon (thats a lot of Psychic, my head hurts)

There are reportedly 3,000 copies of the card, but only 121 have received the coveted PSA 10 Gem Mint grade, which is why collectors are willing to pay outrageous amounts for the First Edition Base Set Holo Charizard

Given this, I often think its better to just hold on to your old collection, the value you get by selling is minimal