This is a very slow spell - you don't want to be playing Stock Up on turn three when facing aggro - but later in the game it gives you really good access to the cards in your deck, making it perfect for controlling, spells-heavy decks
Normally in Magic , if you take an opponent's card, that's easy
I may not gain any popularity by advertising this Eldrazi to the competitive world, but we all know what its capable of
Many powerful Vintage cards are less valuable because the tournament environment is unsupported and inaccessible, [card]True-Name Nemesis[/card] and [card]Courser of Kruphix[/card] were and are worth a significant chunk of the sealed product they were in, rares in sets like Dragons Maze are often blank sheets of paper, and the list goes on
If you think you have a misprint, look it up online and see if anyone else has noticed the same mistake
And that is bad design