So, my brain melts when trying to do the AST opener. I had this thought in regards to it.
I know it's probably really dumb and probably simplifies the class even more, but I figured I'd voice it anyways, because why not.

Reduce the damage potency of all the cards and the melee/ranged preferences on them.
Instead, make all the cards just an AoE buff. Divination instead responds to the cards played.

Balance: Increases Direct Hit chance.
Arrow: Reduces the cooldown reduction on actions.
Spear: Increases Critical Hit chance.
Bole: Reduces damage received.
Spire: HP Regen Effect
Ewer: MP Regen Effect

Stacking cards for Divination will not improve the buffs they provide and will reduce the potency of Divination, as it currently does. You can spam cards to stack their effects to the party, though, so long as the same card isn't played twice in a row, so the party can have Balance, Bole and Spear in their status bar buffing their damage% all at the same time. At the same time, change Sleeve Draw back to it's original ShB effect of instantly refreshing Draw twice while also making it so that it always selects a different card then one you've already used, making a full-powered Divination easy to achieve in the opener.