Well, saying the skill is an ability and not a spell doesn't change the fact that AST doesn't have acces to anything like it. We still could have some of them...
If SCH is supposed to use stacks for something else than indomitabiity and energy drain, there's not a lot of options left... SCH should use their resources according to the situation.
What I mean is: AST has a great toolset, so much that I miss buffing someone when I'm a WHM... But it still feels that we lack something...
To tell the truth, it's kinda boring using just two Dots and spam malefic II. We could use more attack skills sometimes. If stella was instant or off GCD, we could make a lot more out of it. People say it could unbalance PVP, but heavy is halved everytime you cast it, so I don't think it would be a problem.
I agree with the things people say about shuffle, and I would love to see it not drawing the same card again, after all, the reason I use it is to not have that card at that moment...
As for CO, it relly lets me down sometimes... We have a long CD for something that would only help with one tick of LA, Asp.Helios or CU - two if you're lucky to time it right with the server ticking. The stun thing is also something that you can only use once during a pull and usually you don't get it to full potential because you don't have all that hots and spread cards on everyone by the time you use it for the stun. I would suggest that CO was still insta-cast, but on GCD. Sounds like too powerful, but think of it: stun wouldn't last forever - Holy's doesn't so CO's shouldn't either. Extending buffs indefinitely wouldn't also be a thing, since the skill would now spend mp that you could be using for something else and refreshing 5sec of a buff on a 3sec CD wouldn't be that great anyway...
And we can always hope for some better, different skills in the next expansion...