Open the Armory is one of the best Aura tutors, but it is already being used in the Chasing Adventure set, and its white color identity means it cannot be used in a deck built around the Rakdos Shadow the Hedgehog card
Lots of Magic: The Gathering cards that are currently banned in the Commander format are spiking in price
These mythic lands however, remove the cost and if there is a busted card among them, it will streamline deckbuilding for that particular color
The card is a shiny, reflective foil type card
Theyve gotten weaker over the years and need extra bonuses to compete
Not adding to the board upfront -- and indeed, lowering your life -- upfront isn't great, but this does give you insurmountable card advantage if you can survive long enough