changing this to a random quanta cost would pretty much just be a nerf to permanent destruction, which i don't like the idea of. Permanents are already powerful enough as it is. Thing is, earth don't really have that many permanents to protect. Sure, the shield is pretty good...but it can be countered by almost any type of deck by just adding some dragons or something. The weapon is a duo card anyway, so any duo that uses earth has access to PA too. Pillars can be protected...but earth is the element with the pillar destruction anyway. In general, I would say earth is one of the elements that has the least need for permanent protection, which is what balances this card. If PA was time or aether, maybe water or fire even, it would probably be OP or at least closer to it than it is ATM, but it's not. It's an earth card and i don't believe it needs a nerf.