AST really has lots of problems when it comes to various abilities of theirs (seemingly arbitrarily) not being stackable with other similar abilities, whether it's from another AST or even similar things from other classes, when previous healer classes had fewer issues in that regard.

I can see why they wouldn't let multiples of the same card be stackable, but it's got to be infuriating when some other ASTclown in your party keeps overwriting your buffed up Balances with his AoE Spears or something.