Yeah, I think (and hope) you're right about Aura being needed in everything going forward, it definitely makes the most sense to me.
I burnt a lot of Chaos Legion Gold Reward cards for Glint and then used that Glint to get more Rebellion packs, and never looked back... but I know what you mean, and I haven't had the heart to do it myself for the Rebellion cards just yet, but I'm sure I will after I work through my Glint buffer.
The Epic Rebellion Reward cards are really good. I definitely use them more than the Legendaries.