I've introduced Reflect in some of my suggestions, but I have no idea how to implement it. The only reason I introduced Reflect was because since Astrologian is a buff-like class (despite it oriented around cards), adding a reflect effect would be interesting. Maybe instead of a flat shield it's just flat mitigation + reflect % of damage.
Aside from that I actually thought about reverse cards like reverse reads in tarot. At first I was thinking of opposite effects, but in tarot reading it's not necessarily like that. For example (not a tarot example), a non-reverse Bole will be its regular effect; however, a reverse Bole would be increased healing. Ewer can keep its refresh, but in reverse it can boost magic defenses or reduce magic damage the boss will do (debuff).
This may over complicate things, but hopefully it may spark even better ideas?