We start off with a Doran's Shield. Now you might ask, since you've been pushing for mana regeneration why don't you take maybe a Mana Manipulator? My answer to this is we need health, you are going to be harassing quite a bit with Pulverize. Plus the added Armor and health regeneration is great. As soon as i have around 825+ gold I recall and pick up a Heart of Gold and maybe some boots if I can afford them. If my lane is in trouble, or any other lanes, I teleport to them but if it's not I recommend just running back to your lane. After the Heart of Gold pick up Mercury Treads when you can, we go with these because of the tenacity. Helping your team out more with them, plus the magic resist :). Then we finish building Randuin's Omen. This is a great starting item because it gives you health, armor, and health regeneration. After this I immediately go into a Aegis of the Legion. a great item in a team fight. The next item depends if your dying more than you should. If you are, go for the Guardian Angel, if you just need more magic resist go with force of nature. Our final item is Warmog's Armor. I start off with the giant's belt then ruby crystal to get immediate health. Normally games won't last long enough to get this item but if they do you have even more health from this item. If there is a massive DPS on the other team you can switch out Aegis of the Legion for a thornmail after the Randuin's Omen if you are getting focused by the DPS. Force of Nature is the item with the most magic resistance in the game so why not get it? Plus it gives lots of health regeneration which is great after getting out of a fight.
NOTE: UNDER TOTAL RECONSTRUCTION