I'd say you're probably better keeping the Guardian Angel in as it can heal your FFQs.
I'd also say not to put the other Owl's Eye in. This actually seems like a really nice deck, I can't seem to fault it anywhere. Let us know how well it does against other AI5
When you come to upgrading it, I'd start with the Guardian Angel - gives it more HP and a lot more Attack. Then I'd go for Pillars so you can get FFQs out quicker. Then either Adrenaline or Empathic Bond - both of them save you 1 Quanta so just upgrade on preference.
Leave Hope until last as it costs 1 more Light Quanta, and the added 1 defence isn't needed that much in this deck because of all those Fireflies.
Don't upgrade Fireflies or Firefly Queens as they don't give you Light Quanta.
If this works well with AI5, I'll probably give it a go myself. Can only really see a problem against Gravity (Otyugh) Fire (Firestorm) and Death (Plague) - but no deck is perfect
