Ah right, forgot that that was from the subfaction. Then yeah, it's looking good. Down in points, you could easily throw in an Endless Spell or clear up some space for an Ally, but if that's what you've got on hand, I'm betting you'll do alright in the long run even if it's not "optimal". Koatl's Claw is a pretty good pick for the collection you have, or at least the best of the subfactions, I'm not sure if it's better than no Constellation.
Good enough to start playing, though! Maybe once we're no longer all locked away