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Pendulums might be make your deck more stable and consistant. Maybe change 7 life and 9 air pillars into 15 life pendulums. Another tweak might be adding another hope. With only 1 the chances of drawing one of the most powerful shields in the game is slim.
As for upgrades, I would have to disagree with the rustler idea. 1 vs 3 HP is really only helpful vs fire shield, which is going to reek havoc with your fireflies anyway. And by the time rustler becomes useful it is more in the late game, in which the other creatures would have absorbed most of the cc already.
Empathic bond is also only useful in the late game when you are not as tight with your quanta anyway so upgrading those, is not a priority.
I would suggest that the quanta producers (pillars and pends) should be upped first in this deck