Sometimes, theyre benign, even helpful, usually airborne, and always creepy
Joining a Jump In
Theyre part of an elaborate game with a complex set of rules, and any card thats going to give a competitive edge in a game is likely to be valuable
attached to your leader, all of your characters will receive a point to their cost, making it a bit harder for decks like Rob Lucci to remove from the board
Obviously this sample size is relatively small (I might have to do more research on the impact that rare land cycles have on the price of a set in the future), so we need to be careful to take things too far, but at first glance this suggests you're better off buying mythic from sets without expensive rare lands
"Summoned Skull" from this set was previously distributed privately as a sample card, as well as given away in the Kids' WB