To build on what Loramin posted, the bracelet is amazing. There are a ton of clickies available, as far as altering capabilities, there are a few I think.
https://wiki.project1999.com/Earring...e_Frozen_Skull - 4 charges of DA, this is top tier
https://wiki.project1999.com/Duennan_Shielding_Ring - Rechargable DA? Yes please
https://wiki.project1999.com/Ornate_Velium_Pendant - Lets you walk around in SG
https://wiki.project1999.com/Manna_Robe - Best item you'll get on a mage besides epic
These are lesser but still interesting to have.
https://wiki.project1999.com/Shissar_Guardian_Staff - Mana free armor buff
https://wiki.project1999.com/Midnight_Mallet - Clicky slow
https://wiki.project1999.com/Reaper_of_the_Dead - Cheal for your pet
And of course there all the potions you can buy/use. IvU, shrink, Wort, Disease/Poison cures, port pots etc.
Mage is a class that is all about kit, playing a naked 60 versus a kitted out 60 is night and day! Here is the cure for your root woes:
https://wiki.project1999.com/Crystalline_Silk_Net
It's easy to farm, and you get valuable silk while doing it, just carry a few around with you and use liberally. You can recharge them at 1 charge, they disappear after 2nd charge.