This is kinda hard way to play like this and people wil call you noob and so or maybe it is but in my opinion it owns lol.
wel speciualy in early game its good to get feeded.
why i like to play this stile is you cant die when u keep skilling.
oki you do fail when ists 5 on 1 but i never hat i lost agains 2 or 3at end game.
unless they are 3 tanks whit 5k hp. but then you can stil get them down whit no problem 1 on 1 or 1 on 2.

how to use your summoner skills and why i choose these

ther are only 3 very effective to use as katarina

GHOST
EXHAUST
IGNITE

exhaust you need aniway but you can switch between ghost and ignite i rather got ghost cus ignite issnt somthing i like to use but its good at early game but ghost wil be good the whole game and later at game ignite issnt that use full animore for my feeling.

Ghost you only use for chasing a other champ and he isnt ani more in your shunpo range or exhaust range or hextech gunblade range to run after him but first use shunpo then bouncing blade cus other you give him to much run time. so he cant reach turrent if you do it good if you dont just shunpo finish him and use shunpo again to escape lol and you stil got ghost so you wil be gone.

im stil updating this build cus im also experiencing whit som things and hope i can also explain you guys how to use it my english isnt that good but i hope i can give great help for you people.

you wil just try to keep ur distance and keep hit the enemy champion`s whit bouncing blade.
as soon as you got shunpo keep using it around while u try to use bouncing blade, so u can avoid the attacks of them by shunpo on minion or your alied champion. you can use pots few times when its needed but gat as soon as possible hextech revolver then u can shunpo to get health back and also bounching blades.

just try to dont play to much offencive and use ghost when u need to give that last hit but skils are on cool down when u tower jump be sure u kill him and use shunpo on the enmy champ that chase you or minion to get out turrent range.

when your almost death and out of pots recall but avoid to recal much rather only recall when u have no change try to get hp back from minions.

avoid fighting in the lane agains evelyn and shaco. it wil be hard in early game when you get stunned. as soon you see evelyn in your lane ask to swich it wil slow you down whit ur items and kils at mid game u cant fight again against evelyn then u can own her mostly in 2 skils.

when u dont get kills at early game and its going realy bad. then try get your gunblade but wil take to long then you can change lane and go gank some for kils or use shunpo for last hit but it is kinda fail when you need to do it but if you have to then do it. The result of the game wil change alot when u get some kils.

Here is the part where realy fun starts now you can leave your lane few times to gang the other champions while doing that u can get more kils and get faster more items.
but when u fighting some one that try to run away you stil got al skils use bouncing blade > shunppo afther the throw so be fast > then exhoust (if exhaustis cool down use bilgewater cutlass)then u can finish him whit ur ultimate or shunpo then ultimate.
this work good also agains tanks.

end game is killing not that hard animore you can shunpo in it and ulti you get like 60% of ur ulti demage + shunpo demage back and use bounching blade after ur ulti and it also give like 500 health back you can keep spamming ur hextech gunblade as much you can. they wont be abel to get away and you can finish then when u cant finish some 1 use exhaust but rather keep that skil use more hextech gunblade. exhaust is very use full when u cant get to some1 animore then just exhaust him or when skils are on cool down.

i noticed that if i go against zilean his bomb range is longer then ur bouncing blade.
but it was hard to fight against him but i hat idee to bouncing blade and shunpo out it but also failed if he is fast targeting.
so i used bushes to attack him and back of whit shunpo to minions thil it was mis game and i hat my first hextech gunblade.