i know that this question is a bit hard due to what hero you bless and what you plan to fight. I have the first 4 open.; VE, AS, EG, and LR. Which should i upgrade first or do I try to upgrade all at close together?
imo eye of garuda and goblet are the top two artifacts because they can actually affect the outcome of a battle or improve heroes significantly. axe is a good bonus for the extra attack, but dmg reduction mechanism in the game can reduce its effectiveness. victor emblem imo is situational and the least impactful because of its defensive nature. lightning rock has low % for crit resistance and sometimes is not measurable, so for me the good thing is the speed bonus for arena. so if you ask me, focus on the goblet and eye of garuda first before anything else.
HBM AF, ID6-10
I personally use eye on cupid most of the time. I don't care about his damage, he is used in most modes (mine has 8scatter), he is ranged (so he can hit from further away and does not get hit as much), it has a cool down, so faster attack doesn't matter, and since he doesn't die much, I would rather not move a hero that could greatly use another artifact (sk with goblet is hard to kill).
Just my 2cents.