Twenty kills is entirely realistic with that build.
But it definitely sounds like someone who, after seeing someone play this in a match, played a bot game then got really excited with their results.
Originally Posted by Kamikaze Koala
its not just that... a good spellpower build is just so much better with lich bane
Depends on team make ups, yours and theirs, and your lane match up.
Its usually best to decide what you are going to go with, physical or AP, build wise after you buy boots and Sheen based on the flow of the game.