Personally, I think cast speed or magic speed would be the most useful. I’d then put defense at a clean second. What do you think? (and I’m not talking about the stats boosts at level 60, rather the stat boosts that would be more effective at level 200+, where they actually make a noticeable difference to your character)
i feel like this really depends on your magic
say for instance you’re a paper user, destruction is gonna make a huge difference for you.
however if you’re an iron or gold user, magic speed might.
agility all the way either way
im thinking we might see builds with multiple enchantments like casting speed + magic size + power + defense at high levels, when all it takes to bump ur cast speed up is a keen major amulet.
What I’m interested about is will the player be able to stack enchantments later on in the game or a way to bump the enchantment up, that would be pretty cool.
Ive mostly been upgrading magic speed and cast speed, I use light and ik its the fastest magic but it aint fast enough for me 
I NEED MOAR SPEED!!
And it’s hella annoying that the NPCs high jump right when you start casting the spell, speed will teach them a lesson.