Just gonna leave my opinion here,
Upgrade order for OP (My opinion) :
Enchant Artifact to make the enchant happen faster, be more reliable, since you tend to have enough aether quanta usually. Also, as I discovered with these upped, this creates excess Earth quanta. What can use Earth Quanta? Golems. PU Golems + Earth Quanta = Even stronger Golem (Note: the earth quanta is a BONUS for the deck, don't rely on it too much, for example don't PU a Golem early on with only 10 Attack...)
Dimensional Shields to make it so that you don't die if you don't have exactly 6 or more quanta. Can be a life saver.
PUs for same reason as above, these all make the deck more reliable.
Pillars. I put these last by my preference of, unless I can upgrade ALL the pillars, it really isn't worth it as much as the 2-3 different cards I NEED out.