Hey guys i know theres a billion builds for a crit gangplank but heres mine. see if you like it.
If you do decide to use it play it before you vote on it.

The reason i built him like this is because all of the other builds i tried for him with crit didnt work that great, i always found them lacking in one area or another. Then i tried building my own combined with another one i found on here and that seemed to work well.

PROS
- very useful in mid and late game(ive played a few games where my team was losing and we defended enough and i got fed a little bit and we pushed their base and we won)
-good at killing enemys with LOW health that are running away due to his passive combined with the ghost.
-useful in a team fight
-does high amounts of damage
-good at killing creeps and getting gold
-works well in 5v5

CONS
-not that great in early game but if you can manage a kill soon he starts getting better
-low health early game
-low mana thruout but thats what claritys for
-susceptible to ganks

I got some basic crit chance and crit damage on there but i also have some AP and when you combine that with a crit while using your "Q" or your ULTI you do loads of damage

Basically i set his masteries up so he can be a successful melee mage.

-I found out that the elixir of agility is very useful for starting the game due to the fact that it gives him the perfect stats he needs for a low costing item until he gets berserkers greaves and avarice blade.
-the health potion in early game helps out with laning longer
-after this youre going to want an avarice balde to help buy the boots quickly.
-avarice blade really helps out with its passive to buy things fast
-after you get the boots and the avarice blade your going to want to stay close to your team for a while until you get more gold to buy an item or two towards infinity edge.
-after this you can start soloing for a bit and rack up a few kills
-once you get infinity edge you can tear stuff apart but your going to want another avarice blade for its gold gaining passive since you use one up in buying a youmuus ghostblade
-after this the avarice blade should be doing work and you can finnaly buy your other items
-executioners calling helps with regaining any lost help you might have and more crit chance
-rod of ages helps out in the health adn mana department as well as AP
-by now you should be finishing up the game but if its lasting long get atmas impaler for defense and even more crit.

your two main skills during early game are going to be your parrrley and your heal, then at level 5 get rasie morale for a sweeeet team buff while you stick together with your team like i said before in the items section. thru out the game keep advanceing parrrley and your heal but dont forget to throw raise morale in there sometimes.(and your ULT)

Your ultimate and raise morale are very good in team fights because of the buff and the effects of your ULT.
My battle plan before i fight somone or in a team fight is if i have it i pop the active from youmuus and use raise morale. then we/i run in there and i hit somone with parrrley. when we/i are in the midst of it all i pop the active from executioners calling if i have it and right after that i pop my ULT. to slw them down and do quite a bit of damage. after this if the enemy champs are pretty much killed offi check if im low on health i use my heal.also, if me and my teammates need some mana i use clarity. but if i want ensure a kill on a fleeing enemy i pop ghost up and chase him down with my passive and my parrrley and my raise morale if its up.

Anyways if you follow this guide correctly you shud be able to rack in quite a decent amount of kills and assists. Thanks for viewing and feel free to commentand/or give constructive criticism to make this better and before you vote on it, play it.