I played him as a caster/Tank Role.
specialized on Health Regen and CD with a touch of AP
Started with Warmogs (yeah Warmogs expensive like hell ) but when Farmed provides you with lots of HP and regen
next up boots and Soulstealer (boots depending on the Team)
--> Force of Nature
Red--> Magic Pen
the rest AP/lvl
all in all you got a crazy amount of Health and AP
you can hit the 27%CD mark easy
here a Screenshot and a link to my idea
Second, do realize you're spending 3k more gold on this build than mine. By principle, I don't show any core build with a cost greater than 10k, because you will often not get that much gold in a game unless you're stomping.
I appreciate your comments, though.