On December 16, presumably not long before the new Magic: The Gathering banlist update, a fan (who must surely be either kicking themself now or trying to cancel the sale) sold a near mint copy from the Scars of Mirrodin MTG set for $71
It also works identically to Prowl, except it is specifically for Assassins and can't be changed from that
At the time, there were all kinds of people - those who just wanted to collect and display cards, others that used them as investments, and even some who would open pack after pack on the spot to see if they got lucky
Ultimately, this is a low pop, holographic, extremely rare chase Pikachu no wonder its worth so much
But now that they have a new set in the modern era under their belt, this set should hopefully push into some fun territory
Other times its a strategy - for example, knowing you want to play as many lands as possible or win using an alternate win method, such as milling your opponent so that they lose when they cant draw any cards