Aye- They could make it he stances tie-in with what the cards do inherently.
(Potency increase or Dmg mitigation)

Essentially giving something (like shields) and (Regen) in. Roundabout way.

However, the problem still remains that
There is currently no reason to give any cards seperate names or identities if they all do inherently the same thing.

It's just matching colours to create a seal for divination.

If they still want an element of fate creating variability of somesort. And the old system was just (too many variable cards). Then it's just about creating paired effects.

If there are 6 cards, create either 3 different effects on each pair. Or, 2 effects for each group of 3.

....

What (was) fun about Astrologians was being able to adapt a string of drawn cards as a form of utility to compensate for any situation.
Low on mana? (Ewer)
Tank low geared (bowl)
About to enter a dps phase of a boss? (Balance) etc...

It's this mutability which gave the class it's excellent mutability.

And I miss it dearly...