The sign system itself might be good, it might need a little tweaking.
We don't know, i have been saying that divination may need ashorter cooldown to actually be worth something.
Or randomize the seals on each card so it's harder to mix and match. That alone would make it a little more complicated since you never know what card/seal combination you might get. ANd i think that would be the best solution to people who want random.

The problem, however, is when you are forced to use cards that don't do anything. Arrow would be heavily prefered over Ewer in that case, ewer would be burn fodder to buff your next card.

Spire would just be foddered since you rarely need more healing other than maybe bigger shields, but not needed.
The "more healing" effect is exactly what whitemages don't want to have, yet get on everything and anything.

and Bole would yet again be foddered since balance is balance and balance is unbalanced.

Yes, they might have uses, i will never talk against it. But situational doesn't work if those situations don't happen.
I just have been fighting against just drawing ewers/Boles/spires for the last half of orbonne since i got nothing else and nobody needed any of that.