So I am not sure how I feel about aura's, after a bunch of runs they are not adding enjoyment for me. They feel like in most cases they are diminishing the strength/reason to care about many types of seeds, duplicating them, or could be implemented more cleanly as seeds rather than auras. That if the goal is to expand the value of tactical choice there is lots of opportunity to make what seed you are playing at the time more valuable with the same end impact that auras have.
I can understand wanting to explore ways to add more layers of resource management, but I think the game probably doesn't need it? I think there is a strong set of systems in place without auras, that depth can be achieved through additions and balance within those systems instead of though adding new systems, at least in this case.
Hope I don't come off as too negative, is just one opinion :)