Well for this Jax it's all about being a tanky Hybrid which will give your team a late game advantage unless the other team is already fed enough. This built will give you major amount of kills and assists.

The runes for this Jax will give you an advantage on being tanky in the beginning of the battle. It gives you a little AP in the beginning so when you get Empower you can start farming at lvl 3 or lvl 4 and gain some gold so you can buy parts of the built.

Jungling with an Hybrid Jax is pretty easy when you have a Guinsoo's Rageblade first and the AP/AD combination makes the damage to the neutral monsters like it's a weak bot. You should always start off with jungling if you are in the top lane and you pushed it close to the enemy's tower. It will get you fed pretty quick when you start off jungling fast.

Well to start off you'll always need one of the tanky boots for being tanky for early kills. If the team is mostly AD pick Ninja Tab or if they're mostly AP pick Mercury's Treads. Then you'll need Guinsoo's Rageblade soo that your AP will match up with you AD and you'll do tons of damage on enemy's tank, etc. Then you should give two Hextech Gunblades with will be a major help in a hybrid built. Then after that you should get a Phantom Dancer because you might be too slow to catch up to your opponents. Then the last thing you'll get is a Guardian (if your in Summoner's Rift) or a Trinity Force (in Twisted Treeline)

In 3v3 Counter Strike will always do the best in ganks or if you already have a stun then go leap strike. Then at lvl 6 quickly get your Ult and you'll be OP as a hybrid Jax will be during the late game.

The summoner's spells that I used was flash because when you get ganked by other team it will help you get out of there quicker or use ghost it will also be a good option in early game ganks. I used ignite for all the time your opponentes try to get away from you and you only have a little bit more damage to do but your too lazy to attack or you have no mana on you.

Jax is one of the best champions to farm on 3v3s or 5v5s. It will be easy to farm early game with this built and runes you got. Just when you get to lvl 6 get your ult cause it's passive does AP damage after a couple of hits and that will damage your farming very well and give you allot of money and help you get xp if your a low lvl.