It looks like SE is trying to make AST a mobile healer that focuses on quick heals at the cost of those heals being weaker. Unfortunately some of their skills seem to counteract this.... I think some of these changes would support the idea of a healer with weaker, cheaper spells.
Lightspeed- As is this skill is very difficult to justify using- it is too niche in it's uses and is the closest thing we could have to a burst healing tool but fits that very poorly. First off weakening the already less potent heals of the AST makes it a simply unsustainable cd to use as you will burn through too much mp for not much benefit. Secondly the instant cast speed does us little good if the GCD is not lowered as well- most cast times are at or less than the gcd as is making you not REALLY healing much faster, although you do gain mobility. This cd should both decrease mp costs of spells a bit to match the weaker potency and shave some time off the gcd. Perhaps 15% mp reduction and 1.0 off the gcd (I say a flat amount off the gcd as the spell gives a flat amount off your cast times as well. seems to make more sense if both follow the same line of thought) Also lower the potency reduction from 25% to 15%...No reason to act like it's cleric stance.
Shuffle- this spell should prevent you from drawing the same card twice. The whole flavor behind the spell when you get it certainly makes it sound like you should redraw the same card. In practice we use shuffle to remove an undesirable card and have slight control over our rng- getting the same card anyways makes that 'control' an illusion. Alternatively have shuffle, or if you allow a card to go un-used (time out) to reduce the cd on draw.
Collective Unconscious- This flies in the face of much of AST's toolkit. As a mobile class that does not even need to enter the fray for their aoe dps (holy/assize/miasma2 are self centered, gravity is not) why make them both get into melee range AND stay still without casting to get use out of this spell? It should be a ground targetable aoe like the spells it mimics. Nerf the potency if you must, to be weaker than whm/sch but this is just plain silly right now. I would rather a weaker spell than the self-centered spell that prevents me from being able to cast or move. I suppose being able to place it around self then move would be acceptable too.
Gravity/Stella- I agree with the above post about giving gravity heavy effect- it certainly makes sense, and stella some other effect (though idk about paralysis). Sidenote- anyone else find it funny that people playing AST prior to live in the press events and whatnot said they had a lot of weak aoe dps and yet they have one single aoe spell, that isn't weak at all?
While some other changes could be added as well I think it best to make less changes, or smaller changes, than doing too much at once for balance's sake. Make small adjustments and see how it goes before going too far in either direction. This is also why I don't have many card changes listed here-wanted to focus more on the other areas to see if they are just holding the cards back from being able to shine since they don't cover AST's weaknesses atm.