Learning how to properly play AST

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Once you get to 60 you can do this thing...
Synastry -> Collective Unconscious -> Swiftcast -> Aspected Helios -> AoE Card Buff -> Aspected Benefic -> Time Dilation -> Celestial Opposition -> Cleric Stance -> Luminiferous Aether -> 20x Gravity
and as long as you don't have a DRK, you can stand (float?) there casting Gravity forever without healing the tank and without running out of MP.

Synastry increases Collective Unconscious as well? I didn't know that, I thought it just increased actual magic spells not abilities? Would love to find out as I didn't realize that, otherwise I'd use it before CU often then.

If you use Lightspeed as an Oh Shit button, remember that its full potential lies not in making your heals instant but rather in allowing you to perform actions in between heals without costing any time.

I don't entirely agree with this. You're forgetting to mention that Lightspeed lets you cast while moving for most spells. I use it all the time, can run to one end of the arena, pop Helios, and then to the other and do it again if necessary. Great for those instances where people are spread out, especially since it reduces MP by 25%. 90% of the time I use it it's while running or moving.

[Parawill]

Synastry increases Collective Unconscious as well? I didn't know that, I thought it just increased actual magic spells not abilities? Would love to find out as I didn't realize that, otherwise I'd use it before CU often then.

No.

I would also use Luminferous Aether in tandem with Celestial Opposition to get an extra tick or two of MP, thus getting you more MP in the long-run.