Olafplank: The new (not so) OP build that you can try.
_Disclaimer _ :Only try this build in normals. This build is not for ranked. It' purely for fun.
This build is for Gangplank, although it may work on Rengar and Irelia as well.
Summoners are 
.
The build is as follows, and you cannot stray from the build, or else it won't work (You should also build in this order): 
,
, 
,
,
, 
(To share the love). Late game, buy a 
to resist even more CC. You will also take no Magic Damage. Like, at all. It's purely for fun, but you will never be CC'd. Ever. Again.
