The value is generally tied to the card's playability in eternal formats like Commander
So few people had the experience of opening a Black Lotus or Mox Sapphire when Magic was originally released that we wanted to recapture some of that iconic experience for generations new and old
Life is a pretty easy one to understand, but I dont mind these cards making you lose other things as well
Spending, essentially, four mana to exile your land, exile all graveyards, and pick up a Historic card before doing so, is an absolutely fantastic ability for a Utility land
As far as the other new Slivers, there are two Im opting for in my build
Amoeboid Changeling The main use of Amoeboid Changeling is manipulating creature types, especially your opponents