The mechanic is almost certainly not evergreen, with the name of the set carrying a small amount of the crime spree flavor, but theres no reason why we wont see it pop up again in the future
Of the promo cards worth over $100, the majority are either special foil reprints issued as rewards to tournament judges for their work on the game, or extremely limited promos sold exclusively at San Diego ComicCon
Others hated the card frames, the lack of instant-speed flexibility, and the seemingly weak return on investment
Academy Manufactor staples itself into many commander decks and makes a lot of token artifacts for you to use
You just have to wait two upkeeps later to get the corpse party started
For decks full of one or two drops, this card can be a nightmare for which they will happily trade multiple cards, as the Keg amounts to a two mana one-sided Wrath of God or sometimes even worse by killing artifacts like Cursed Scroll, Winter Orb or Ankh of Mishra