One of the 16 Invokerism builds: The Drainer.
Specialized to counter mana dependent teams (e.g. Medusa, Leshrac etc) this build excels in draining all their mana.
Lane: Mid lane
Spells to focus on: EMP, Alacrity, Coldsnap

Full guide at: http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=131293957#33921