Looks like a fun set! One thing that jumps out to me is that since Arcane cards have a set print number, so there is an incentive for players to hold unopened packs and wait for packs to be burned in order to increase their odds of pulling an Arcane card. Was this intentional?
If not, then it might be possible to instead keep Arcane chances the same across every pack and then after a set amount of time (e.g., after the sale/burning is over) offer players holding specific BF/GF cards (chosen randomly, maybe weighted by bcx for combined cards) the opportunity to "redeem" (send in) their card for an Arcane copy that wasn't pulled. That would incentivize players to open and use CA packs, instead of just sitting on them.
RE: Introducing Conclave Arcana!