Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Most of the damage your going to do early game comes from your parley so starting off with the 8% crit chance gloves will help for early kills if you try to gank
The avarice blades are very nice since they give you a good amount of crit (24%) and help give you money for your Nashors tooth which you should be getting next after you finish off your berserker's greaves
I think Nashors tooth is an amazing item for Gankplank because the -25% cd reduction helps him parley more and reduces the long cd on remove scurvy + the ab makes it heal for more and the attack speed is just a helpful bonus for later game with your massive crits
Next an infinity edge gives you the damage you need and makes you crit more often for more damage
Phantom dancer is very good because of it's good crit chance additional attack speed and helps you survive because you can dodge with the higher move speed and the passive dodge chance allowing you to parley more
Most games won't make it to this point but at this point it's a good idea to trade in your two avarice blades for a executioners calling and atma's impaler which both maintain the crit chance with the bonus of new good abilities and the lifesteal definitely helps to stay up and keep assisting your team
I like ignite because the dot damage to help finish people off early and mid game but also your passive decreases healing by 50% and ignite does as well for a total of 75% reduction (it isn't additive) making it far far easier to kill heroes like mundo, mordekaiser or others who depend quite a bit on hp regen
Ghost on the other hand is pure preference I like it so I can run into a team fight after initiating with my ult slowing them so you can get in close and parley and hit them
Flash and clarity may also prove useful. Flash can put you right into the middle of there team after you ult or can get you out if you need to excape. Clarity will help you stay up early by having plenty of mana to use cure scurvy and parley a lot
How I play gankplank
At levels 1 and 2 of parley it is more worth it to harass enemy heroes but once you hit 3 the gold bonus from killing creeps with it is so large that killing creeps with it even if it means running out of mana is completely worth is since it nearly doubles the money you get from a creep kill at lvls 4 and 5
As for the ult I normally use it rather well in team fights and the ap from nashors tooth makes it slightly better which never hurts. Although early game sometime near when you hit 6 if you see someone low enough in another lane or yours you may want to alert your team that your going to use it. Waiting till their near you tower is a good idea since you can put your ult 33% over them and 66% behind them that way they either run towards your tower or into the full dmg of your ult making for an easy kill with ignite and a parley
Using cure scurvy alot to stay up late game is good since it heals quite alot and doesn't cost that much plus you should have nashors tooth which gives you mana regen. Although if you think you may be going into a team battle don't use it because using it to cleanse yourself of a slow or stun in a team fight is invaluable
You'll probably notice that if you follow this build you'll end up at 112% crit chance and you may be saying to yourself "why would i get crit runes if i hit 100% anyway?" and I'll tell you this build is difficult to complete and although it is true your runes become useless if completed but the extra crit chance will help enough early game to more then counter balance it's lack of use very very late game.