The answer is the same one that has been prevalent for most of Moderns existence: People showed up with the wrong answers
And the legendary Phyrexian continued to drop in worth following the launch of MOM
Its nice when it works, and players may think more highly of it because of those memorable instances, but its not as good all around as either Computer Search or Dowsing Machine
Regional Pokemon Center exclusives track the same pattern: the Fukuoka Special Box went from 2,090 MSRP to over 30,000 on the resale market
My Tendrils Run Deep Ongoing Scheme (An ongoing scheme remains face up until it's abandoned.) You may play an additional land on each of your turns
I havent noticed many lifegain decks running around recently, at least not in Standard, but they do exist in abundance in Pioneer and Explorer, so it might be intended for those formats