Maybe the connection is a creature type, or the cards play well together, or they have some story element in common. And, unlike Draft Boosters, there is only one guaranteed uncommonwhile the other five cards all have a chance of being common or uncommon
Still, some are drastically more expensive than others, or hard to get hold of after limited print runs
I even spent one evening staying up way too late poring through every nook and cranny of my collection before I could confirm My Sliver Queen was gone
With the recent introduction of Daisy Duck Donalds Date and Genie Wish Fulfiled, aggro has become stronger as an archetype despite still having issues at major events
A Delta Ancestral Memory has even sold for around $18,000, showing just how scarce and desirable these pieces of Magic history are today