This is my first build, but it always works out for me. It uses Singe's huge mana pool with items that build stats based off max mana. Also with Manamune and Lichbane together, your toss and first melee hit will be devastating.

Just get more manaz.

Somewhat a tank build while grabbing the mana regen in Utility.

Their unique passive's speak for themselves. Duel Rod of Ages is optional, just to give more hp, mana and AP, and their passives are NOT unique, so they'll stack.