On the surface, it's a clean answer to cards like Goblin Charbelcher or Devourer of Destiny
Like with tickets for live sports and music events, the flipping is often instantaneous
New world order In one of his articles, Mark Rosewater introduced us to the New World Order in their design process: They would make sure that the common cards as they are the cards that new players will have the most contact with will never be overly complex: They should be easy to understand and easy to play with, so as these players become more interested and start buying more packs, they will gradually start having contact with rarer, and more complex cards, making the learning curve less steep
Isperia, Supreme Judge The sphinx Isperia was once the guildmaster of the Azorius Senate on the plane of Ravnica
Unfortunately, the servers shut down in 2016, so it isn't available to play anymore
But in todays optimized market era, as Scott points out, you have to assume all packs are weighed