Completely agree with the OP and glad to see someone else echoing what I had said earlier...

Unless SE plans to nerf resource regen in raids, Ewer and Spire are going to be useless by definition because they're cards that should actually never be needed. I guess you could say that Ewer can be used to offset AST's mana issues, but it would be better if the class didn't have those mana issues to start with and Ewer wasn't a waste of a card.

Folks need to remember that the inherent randomness of these buffs means that they need to be VERY good to compensate. A 17% chance of drawing a card means that, when you get the right one, it NEEDS to be amazing.

Frankly, they could probably double the potency and duration on all AST buffs and that might actually put the class where it needs to be...