Synastry as a trait which can trigger when benefic/benefic II is used, perhaps?
Out of the extra healing, Celestial Intersection and Exaltation could easily be nixed along with Neutral Sect to provide a more prolonged alternative to the compromise that is the extra shielding Astrologian gained in the remodel from stance switcher to pure healer. Transform Celestial Opposition back into a non-healing ability; it could become what Disable used to be on an AOE scale while Gravity regains its slow debuff.
The cards are where things fall down, like Archwizard has pointed out. It's a quality that operates fairly well in tabletop (homebrew stuff whipped up by my GM, ignore the digression here) though substantially less so in an mmo. The most I can settle on there is flipping cards to become AOE effects and reducing their frequency in order to better serve non-damage based effects through buffing their effective impact when dealt...but as to *what* can be served up is a puzzler.
Sorry for not directly responding to those who have quoted me. Still a bit rusty with forum etiquette/don't really know what to say in response. I do appreciate it nonetheless, so er...thank you?