you focus on farming and you poke mainly with with "W".
Ex.: last hit a minion "W" on or nearby enemy champ basic attack it if in range otherwise a minion with debuff to chase or kept farming. you take "E" at level 2 to close gap or escape it's very good you can almost get out of hecarim walk of the dead without getting damaged by it. good luck with the build if you try it

Pros: High sustain, great poking,medium to high damage in mid, good escape

Cons: You will be ganked between 300% to 500% more often then regular ap mid because most of the time you will dominate the lane pretty easily.

Mid:Wukong, Orianna, Ryze, Katarina

Jungler: Hecarim, Volibear, Xin, Elise, Udyr

Mid: Teemo, Talon, Lux, Kassadin, Ahri, Brand, Fizz, Irelia

Jungler: Jarvin, Nassus