We're changing a couple of the under-purchased mage items so they have more opportunities to shine. Cosmic Drive's passive is now more accessible, while Everfrost now has a new build path and a few small buffs.
SPELLDANCE MOVEMENT SPEED Cosmic Drive no longer grants bonus movement speed when dealing ability damage
PUT IT IN COSMIC DRIVE If you have at least 160 ability power, gain 20 ability haste and 10-30 movement speed (based on level)
ABILITY HASTE :  ⇒ 20
Bumping up Cosmic Drive’s power to secure its position as a viable second item choice.
ABILITY POWER :  ⇒ 75
If you want to deal death by a thousand spells instead of one needlessly large burst (and move fast while doing it), this is for you.
TOTAL COST : 3000 gold
BUILD PATH : Fiendish Codex + Kindlegem + Amplifying Tome + 865 gold
ABILITY POWER : 70
HEALTH : 200
ABILITY HASTE : 30
SPELLDANCE : Dealing damage with abilities grants 10 (+20% ability haste) movement speed for 4 seconds