AP build. No questions. Meki Pendant
Tear of the Goddess
Boots of Swiftness
Archangel's Sceptre
Blasting Wand/Giant's Belt
Rylai's Crystal Sceptre
Blasting Wand
Zhonya's Ring
Fiendish Codex
Nashor's Tooth
Blasting Wand
Archangel's Sceptre
Level 'Void Ooze' first, and whenever possible.
Never get more than 3 stacks of Living Artillery unless in a team fight late game.