Ap/armor item concept

the item is just in a early concept stage and all stat numbers are subject to change and i'd appreciate any feed back available

Name: Piercing Visor components: + + 600g ( total cost is 3000g) stats: 30 ability power 30 armor 300 health 300 mana unique passive: 10% cooldown reduction unique passive: Mana Piercer- gains 15% magic penetration + 1% for every 500 total mana

this item is designed to give ap casters an all around easier time dealing with marksmen and ad assassins by giving hp and armor as well as cdr in order to cast spells more frequently while still giving ap because as of now there are no items that give mages a one up against some of the marksmen and the high mobility assassins that have been running rampant in mid lane and where it doesn't give a lot of any one stat it does give a nice balance of stats in a trinity force kind of way.