These common cards make up most of the cards in the game, leaving a scant minority of valuable cards
Personally, I think this is a really interesting effect I'd like to test out, but I can for sure see why people are worried
Being the only game in town for no-art lands would make Unstable more similar to Unhinged or Unglued , where if you wanted a certain subgroup of basics for your deck, you pretty much had to buy the set (or at least the lands from the set, which would force someone else to crack a box of the set to sell them to you)
Reflector Mage Reflector Mage was quite the problem child when Collected Company was still in Standard, but its still a strong bounce card
The Seven Warlords (Shichibukai) represent a balancing force between the Marines and Pirates, and this set perfectly captures their essence through exclusive texture foil cards