Masteries: 0/21/9
My build: mana crystal + 2 hp pots > boots (upgrade to mercs when you can) > glacial heart/sheen/negatron cloak (which ever you think you need first. You need all) > frozen heart/bviel (which ever you need first, you need both at the end) > trinity force > randiun's omen or force of nature > situational.
You still do damage, but you shouldn't be the one carrying.