Maybe you wunder why i have not made a full item build, this is because usely I get so overfeed that i can kill the whole team alone. But if you get further go for some ad items and maybe frozen mallet.

I picked ignite because I improved it in my masterys so I can start with 10 more ability powerand because you often meet a mundo in 3v3 and as all know mundo is easy to take down with ignite.
I picked ghost to chase/escape from other champions.

You maybe wunder why i pick improve ignite. It is because i only play 3v3 and ignite is so nice to take down Swain, Mundo and Nassus. And it gives you a nice start bonus of 10 ability power from the beginning.

With this build you will be able to hit about 50% of an ability power or an full attack damage champion at lvl 2. I do personally only go solo lane, because of the fact that i can hurt them so hard by this combo: First activate your "w" ability and then use your "q" ability to jump the target. I only last hit creeps to keep them in center since there are 2 nice bushes to jump out from.

At lvl 6 go top jungle and take down the 2 buffes.

When you got Hextech Revolver you can easy solo the drake in abour 15 seconds (Do it each time you can, it's a really good thing for the team).