They worked for Ravnica block in pairs of colors due to the nature of the set
While it might not be the best investment right now, this is definitely an MTG card worth keeping an eye on
The others have some design issues
Whether it's Waterbending Scroll , from the recent Avatar set, encouraging players to go mono blue, or Mechtitan Core from Kamigawa Neon Dynasty turning into a 10/10 Gundam if enough artifacts are stapled onto it
Forced Draw Payoffs Call it old-fashioned, but the deck with The Rack, Locust Miser, and Gnat Miser is a nasty way to win
Continuing the recent trend of rewarding players for playing multiple Prerelease events, you can also earn a velvet pouch by attending more than one