Alrigth this Trynd build looks weird but try it
Full build:

items around 20min mark:

wits end gives you a strong mid game.
if you don't need much mr early on since
&
is a lot early on,only build recurve bow:

runes for me is all as except for 1% crit mark, flat armor seals, mr per lvl glyphs. mastery: 18/0/12
so what does the new gunblade heal from? wits end, and lichbane? how about sunfire? Or am I dreaming?
delay lich bane/sheen for a while, start with 
now you could say that you'll hardly pre procing spellblade. except you'll have max cdr, so E is like on a 3 or 4 second cooldown depending on how often you crit.
this isn't just about you either applying wits end debuff can really help your AP carries deal damage.
I only played it in bot games so far, for those of you that are adventurist give it a shot.
or
edit: or this
(you can also trade out botrk for IE for more raw damage) Or get sunfire first or second item instead of DMP if youre facing a hard AD champ top

)
,
you're very tanky but still hurt, people tend to blow spells on you, which can help team.