I would much rather se a boring cards expansion for academy. That just has super basic cards and gives all the schools which are needed. Like burst damage, ethereal attacks, creatures that allow for synergy (like very litte damage but tons of healt or the other way around) and so on. Obviously some schools souldn't have acces to specific tools. But with the last Forcemaster expansion the other mages didn't get much. Arena would probably also benefit from this aswell.